[Feature Request]: Support testing of C++ files (VSC-1428)

[11CaptainKirk]

Is your feature request related to a problem? Please describe.
Cannot use unit testing feature with C++ source files as only c test files are detected/supported when using the "unity-app" testing from the test menu in the side bar. Per the documentation on unit testing using the extension, only files following the pattern **/test/test_*.c are detected.

Describe the solution you'd like
Some way to allow c++ test files. Examples of testing c++ files can be found here
It would be nice if it automatically detects if any c++ test files are present, and if so makes test_app_main a cpp file, otherwise just does the existing functionality.

Describe alternatives you've considered
It's possible to test C++ files already but not with the simple vscode tooling that exists for c files. This would probably be a very easy feature to implement.

Additional context

[github-actions]

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