Fix elide-model-config build warnings

[aklish]

Fix the following build warnings in elide-model-config:

[WARNING] /sd/workspace/src/github.com/yahoo/elide/elide-model-config/src/main/java/com/yahoo/elide/modelconfig/model/Dimension.java:[64,21] @Builder will ignore the initializing expression entirely. If you want the initializing expression to serve as default, add @Builder.Default. If it is not supposed to be settable during building, make the field final.
[WARNING] /sd/workspace/src/github.com/yahoo/elide/elide-model-config/src/main/java/com/yahoo/elide/modelconfig/model/Dimension.java:[67,20] @Builder will ignore the initializing expression entirely. If you want the initializing expression to serve as default, add @Builder.Default. If it is not supposed to be settable during building, make the field final.
[WARNING] /sd/workspace/src/github.com/yahoo/elide/elide-model-config/src/main/java/com/yahoo/elide/modelconfig/model/Dimension.java:[80,25] @Builder will ignore the initializing expression entirely. If you want the initializing expression to serve as default, add @Builder.Default. If it is not supposed to be settable during building, make the field final.
[WARNING] /sd/workspace/src/github.com/yahoo/elide/elide-model-config/src/main/java/com/yahoo/elide/modelconfig/model/Dimension.java:[84,25] @Builder will ignore the initializing expression entirely. If you want the initializing expression to serve as default, add @Builder.Default. If it is not supposed to be settable during building, make the field final.
[WARNING] /sd/workspace/src/github.com/yahoo/elide/elide-model-config/src/main/java/com/yahoo/elide/modelconfig/model/Dimension.java:[88,25] @Builder will ignore the initializing expression entirely. If you want the initializing expression to serve as default, add @Builder.Default. If it is not supposed to be settable during building, make the field final.
[WARNING] /sd/workspace/src/github.com/yahoo/elide/elide-model-config/src/main/java/com/yahoo/elide/modelconfig/model/Table.java:[67,21] @Builder will ignore the initializing expression entirely. If you want the initializing expression to serve as default, add @Builder.Default. If it is not supposed to be settable during building, make the field final.
[WARNING] /sd/workspace/src/github.com/yahoo/elide/elide-model-config/src/main/java/com/yahoo/elide/modelconfig/model/Table.java:[70,21] @Builder will ignore the initializing expression entirely. If you want the initializing expression to serve as default, add @Builder.Default. If it is not supposed to be settable during building, make the field final.
[WARNING] /sd/workspace/src/github.com/yahoo/elide/elide-model-config/src/main/java/com/yahoo/elide/modelconfig/model/Table.java:[85,20] @Builder will ignore the initializing expression entirely. If you want the initializing expression to serve as default, add @Builder.Default. If it is not supposed to be settable during building, make the field final.
[WARNING] /sd/workspace/src/github.com/yahoo/elide/elide-model-config/src/main/java/com/yahoo/elide/modelconfig/model/Table.java:[89,24] @Builder will ignore the initializing expression entirely. If you want the initializing expression to serve as default, add @Builder.Default. If it is not supposed to be settable during building, make the field final.
[WARNING] /sd/workspace/src/github.com/yahoo/elide/elide-model-config/src/main/java/com/yahoo/elide/modelconfig/model/Table.java:[93,27] @Builder will ignore the initializing expression entirely. If you want the initializing expression to serve as default, add @Builder.Default. If it is not supposed to be settable during building, make the field final.
[WARNING] /sd/workspace/src/github.com/yahoo/elide/elide-model-config/src/main/java/com/yahoo/elide/modelconfig/model/Table.java:[97,29] @Builder will ignore the initializing expression entirely. If you want the initializing expression to serve as default, add @Builder.Default. If it is not supposed to be settable during building, make the field final.
[WARNING] /sd/workspace/src/github.com/yahoo/elide/elide-model-config/src/main/java/com/yahoo/elide/modelconfig/model/Table.java:[101,25] @Builder will ignore the initializing expression entirely. If you want the initializing expression to serve as default, add @Builder.Default. If it is not supposed to be settable during building, make the field final.
[WARNING] /sd/workspace/src/github.com/yahoo/elide/elide-model-config/src/main/java/com/yahoo/elide/modelconfig/model/Join.java:[46,23] @Builder will ignore the initializing expression entirely. If you want the initializing expression to serve as default, add @Builder.Default. If it is not supposed to be settable during building, make the field final.
[WARNING] /sd/workspace/src/github.com/yahoo/elide/elide-model-config/src/main/java/com/yahoo/elide/modelconfig/model/Measure.java:[57,21] @Builder will ignore the initializing expression entirely. If you want the initializing expression to serve as default, add @Builder.Default. If it is not supposed to be settable during building, make the field final.
[WARNING] /sd/workspace/src/github.com/yahoo/elide/elide-model-config/src/main/java/com/yahoo/elide/modelconfig/model/Measure.java:[60,20] @Builder will ignore the initializing expression entirely. If you want the initializing expression to serve as default, add @Builder.Default. If it is not supposed to be settable during building, make the field final.
[WARNING] /sd/workspace/src/github.com/yahoo/elide/elide-model-config/src/main/java/com/yahoo/elide/modelconfig/model/Measure.java:[73,25] @Builder will ignore the initializing expression entirely. If you want the initializing expression to serve as default, add @Builder.Default. If it is not supposed to be settable during building, make the field final.