#132 Add a CMake build for C++ port

[vityaman]

The part of issue #132.

• Build a static library with name libantlr4-c3.a that is statically linked with libantlr4-runtime.a.
• Test a library using GTest with GMock, Java port test for Expr.g4 was ported.
• Get ANTLRv4 Runtime via downloading v4.13.1 distribution.
• Get ANTLRv4 Tool via downloading from www.antlr.org.
• Support building with sanitazers.
• Test debugging with lldb by pressing a F5 key at VSCode, clangd for VSCode support.

Adding this library as a dependency via FetchContent or something like this is not supported, because requiring to write some config and adding some demo project to test it.

There are not all changes here. Planning to add in the nearest future at next PRs:

• Add clang-format, clang-tidy - separate PR because will contain formatting changes
• Support adding the library as an external dependency
• Porting more tests from TypeScript
• Refactoring, small fixes with regression tests

[vityaman]

This CMake project structure was inspired by the project twist and many others, that I greped in the Internet.

[vityaman]

Oh, I eventually defeated that problem with an absence of GTest and CTest, checks passed at my fork.

@mike-lischke, the PR is ready for review.

[mike-lischke]

Thanks!