Add search attribute alias to field mapping to Namespace Detail for ElasticSearch

[awln-temporal]

Add search attribute alias to field mapping to Namespace Detail for ElasticSearch.

• TODO: Run test cluster and register search attributes via Operator APIs
• TODO: Resolve potential mismatched custom mappers
• TODO: Add query converter interceptors of aliased values for ES Visibility Queries.

Why?

Currently, when a Cluster is configured with ElasticSearch, search attribute registration via the Operator API AddSearchAttributes persist the user aliased search attributes in the ClusterMetadata without writing to the Namespace Detail.

ClusterMetadata is meant to list all pre-allocated custom search attribute column names and their types.

Search attributes are namespace scoped, registering at the ClusterMetadata level leads unexpected behavior.

What changed?

To support backwards compatibility with existing Clusters, existing search attributes in the ClusterMetadata must be replicated to each NamespaceDetail at startup.

All pre-allocated fields must be added to the ClusterMetadata, similar to existing SQL implementations.

How did you test it?

• built
• run locally and tested manually
• covered by existing tests
• added new unit test(s)