feature: Run & debug modes for applications and tests

### Did you check the docs?

- [X] I have read all the docs

### Is your feature request related to a problem? Please describe.

- [x] Run & debug main class https://github.com/nvim-java/nvim-java/issues/4
- [X] Run & debug test class https://github.com/nvim-java/nvim-java/issues/12