[Kernel] Itty bitty refactor (#4188)

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#### Which Delta project/connector is this regarding?
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Please add the component selected below to the beginning of the pull
request title
For example: [Spark] Title of my pull request
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- [ ] Spark
- [ ] Standalone
- [ ] Flink
- [x] Kernel
- [ ] Other (fill in here)

## Description

Just itty bitty clean up -- reduces changes in add/remove action API
prototype.

## How was this patch tested?

Existing tests suffice.

## Does this PR introduce _any_ user-facing changes?

No

kernel/kernel-api/src/main/java/io/delta/kernel/Transaction.java

@@ -117,7 +117,7 @@ static CloseableIterator<FilteredColumnarBatch> transformLogicalData(
     // Note: `partitionValues` are not used as of now in this API, but taking the partition
     // values as input forces the connector to not pass data from multiple partitions this
     // API in a single call.
-    StructType tableSchema = getLogicalSchema(engine, transactionState);
+    StructType tableSchema = getLogicalSchema(transactionState);
     List<String> partitionColNames = getPartitionColumnsList(transactionState);
     validateAndSanitizePartitionValues(tableSchema, partitionColNames, partitionValues);
 
@@ -167,7 +167,7 @@ static CloseableIterator<FilteredColumnarBatch> transformLogicalData(
    */
   static DataWriteContext getWriteContext(
       Engine engine, Row transactionState, Map<String, Literal> partitionValues) {
-    StructType tableSchema = getLogicalSchema(engine, transactionState);
+    StructType tableSchema = getLogicalSchema(transactionState);
     List<String> partitionColNames = getPartitionColumnsList(transactionState);
 
     partitionValues =
@@ -209,7 +209,7 @@ static CloseableIterator<Row> generateAppendActions(
     return fileStatusIter.map(
         dataFileStatus -> {
           if (isIcebergCompatV2Enabled) {
-            IcebergCompatV2Utils.validDataFileStatus(dataFileStatus);
+            IcebergCompatV2Utils.validateDataFileStatus(dataFileStatus);
           }
           AddFile addFileRow =
               AddFile.convertDataFileStatus(

kernel/kernel-api/src/main/java/io/delta/kernel/internal/IcebergCompatV2Utils.java

@@ -27,7 +27,7 @@ private IcebergCompatV2Utils() {}
    *
    * @param dataFileStatus The {@link DataFileStatus} to validate.
    */
-  public static void validDataFileStatus(DataFileStatus dataFileStatus) {
+  public static void validateDataFileStatus(DataFileStatus dataFileStatus) {
     if (!dataFileStatus.getStatistics().isPresent()) {
       // presence of stats means always has a non-null `numRecords`
       throw DeltaErrors.missingNumRecordsStatsForIcebergCompatV2(dataFileStatus);

kernel/kernel-api/src/main/java/io/delta/kernel/internal/data/TransactionStateRow.java

@@ -60,11 +60,10 @@ private TransactionStateRow(HashMap<Integer, Object> valueMap) {
    * Get the logical schema of the table from the transaction state {@link Row} returned by {@link
    * Transaction#getTransactionState(Engine)}}
    *
-   * @param engine {@link Engine} instance to use for parsing the schema
    * @param transactionState Transaction state state {@link Row}
    * @return Logical schema of the table as {@link StructType}
    */
-  public static StructType getLogicalSchema(Engine engine, Row transactionState) {
+  public static StructType getLogicalSchema(Row transactionState) {
     String serializedSchema =
         transactionState.getString(COL_NAME_TO_ORDINAL.get("logicalSchemaString"));
     return DataTypeJsonSerDe.deserializeStructType(serializedSchema);