Deprecate bs-dependencies and bs-dev-dependencies

[Bushuo]

Fixes a part of #7455

• Introduces a global deprecation registry that logs a warning the first time a key is inserted.
• Deprecates bs-dependencies and bs-dev-dependencies
• Changes to the config struct to track which deprecated fields are used
• Update the testrepo to use the correct field values
• Add a test package to emit the deprecation warning

[pkg-pr-new]

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commit: 1bd6371

[cknitt]

This is great! Thanks a lot for your work!

Could you maybe also include the bsc-flags -> compiler-flags renaming (also proposed in #6475) to get rid of the last remaining "bs"?

[zth]

Reminder that this needs to be updated in other tools that use the config file as well. Editor tooling is one, maybe the only one.

Maybe we could have a look at having rewatch supply the needed build state from these things to whoever needs them, like the editor tooling.