fix: adjust text equality to force index matching on indexes - BED-8505

[zinic]

Description

• Add jsonb_typeof SQL function identifier
• Route text property equality away from JSONB casts
• Add string property equality predicate builders
• Apply string equality rewrite during expression lowering
• Update SQL fixtures for indexed text equality
• Add synthetic reconciliation index stress test
• Update text equality rewrite unit expectation

Resolves: BED-8505

Type of Change

• Chore (a change that does not modify the application functionality)
• Bug fix (a change that fixes an issue)
• New feature / enhancement (a change that adds new functionality)
• Refactor (no behaviour change)
• Test coverage
• Build / CI / tooling
• Documentation

Testing

• Unit tests added / updated
• Integration tests added / updated
• Full test suite run (make test_all with CONNECTION_STRING set)

Driver Impact

• PostgreSQL driver (drivers/pg)
• Neo4j driver (drivers/neo4j)

Checklist

• Code is formatted
• All existing tests pass
• go.mod / go.sum are up to date if dependencies changed

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