refactor(gcpspanner): Generalize Spanner helpers for pointers and pagination #1986
      
        
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This foundational commit refactors the generic Spanner entity helpers to improve consistency, reduce boilerplate, and support more advanced use cases like cursor-based pagination. This makes the data access layer more robust and maintainable for the features that will be added subsequently.
client.go:entityCreator'screateandcreateWithTransactionmethods now return*stringfor the newly created entity's ID.entityListerhas been refactored to use an interface-driven approach for pagination, returning a*stringfor the next page token.entityRemoverhas been updated to be key-based, simplifying its usage.lib/gcpspanner/package to align with the new function signatures and patterns.