Add ID field to search protobuf

[bryanlb]

Summary

Adds protobuf support for the new ID field, as this is causing exceptions throughout the pipeline.

java.lang.IllegalArgumentException: No enum constant com.slack.kaldb.metadata.schema.FieldType.ID
	at java.base/java.lang.Enum.valueOf(Enum.java:293)
	at com.slack.kaldb.metadata.schema.FieldType.valueOf(FieldType.java:33)
	at com.slack.kaldb.metadata.schema.LuceneFieldDef.<init>(LuceneFieldDef.java:18)
	at com.slack.kaldb.metadata.schema.LuceneFieldDefSerializer.fromLuceneFieldDefProto(LuceneFieldDefSerializer.java:27)
	at com.slack.kaldb.metadata.schema.ChunkSchemaSerializer.fromChunkSchemaProto(ChunkSchemaSerializer.java:32)
	at com.slack.kaldb.metadata.schema.ChunkSchemaSerializer.fromJsonStr(ChunkSchemaSerializer.java:53)
	at com.slack.kaldb.metadata.schema.ChunkSchema.deserializeFile(ChunkSchema.java:27)
	at com.slack.kaldb.chunk.ReadOnlyChunkImpl.handleChunkAssignment(ReadOnlyChunkImpl.java:230)
	at com.slack.kaldb.chunk.ReadOnlyChunkImpl.lambda$cacheNodeListener$0(ReadOnlyChunkImpl.java:146)
	at java.base/java.lang.VirtualThread.run(VirtualThread.java:309)