test: add openCypher TCK test suite with CI integration

Andrew Newdigaterequested to merge
tck into main

Add Technology Compatibility Kit (TCK) tests from the openCypher project using Godog for BDD-style testing. Tests use the 'tck' build tag for isolation from integration tests.

Key changes:

  • Add TCK test infrastructure in itest/tck/ with Godog step definitions
  • Add openCypher submodule for official feature files
  • Add CI job using gotestsum with JUnit XML reporting
  • Configure CI job to allow failures during initial implementation

The TCK tests validate Cypher query compliance against the official openCypher specification using isolated database tenants per scenario.

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