Integration tests for fory:

• jdk_compatibility_tests: test fory compatibility across multiple jdk versions.
• graalvm_tests: test graalvm native image support.
• jpms_tests: test JPMS module names.
• idl_tests: test Fory IDL cross-language generation and round trips.
• grpc_tests: test Fory gRPC companion interoperability across languages.
• cpython_benchmark: fory CPython microbenchmark.

Note that this integration_tests is not designed as a maven multi-module project on purpose, so we can introduce features of higher jdk version without breaking compilation for lower jdk, and add integration tests for other languages.