#168 Add Java port Whitebox and Expr tests

[vityaman]

• Added VSCode Devcontaner configuration
• Translated Whitebox tests from TypeScript to Java using an LLM.
• Translated Expr tests from TypeScript to Java using an LLM.
• Translated CodeCompletionCore from TypeScript to Java using an LLM.
• Fix a bug with a ignoredToken dependency at followSet computation

[vityaman]

As we see, tests are failed, so bug hunting is required in Java port. I will work slowly on this during the next days when I will have a free time.

[mike-lischke]

Keep in mind the Java port might not be up to date. If the tests return different values you will have to check that the Java code behaves like the TS code.

[vityaman]

I faced with that bug that test results depends on an order of execution. This is becase followSets caching is ignoredTokens aware. I forgot about it, but is actually already fixed in C++ port: https://github.com/mike-lischke/antlr4-c3/blob/main/ports/cpp/source/antlr4-c3/CodeCompletionCore.cpp#L135

[vityaman]

I think we actually can merge this now and I will

• fix this bug at all exiting ports
• setup GitHub Actions to run tests in a shuffled order to catch such bugs

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• Simple expression parser tests fail when executing out-of-order #77

[mike-lischke]

Thank you @vityaman