Expose `statement list`

[dvmarcilio]

Hi. We would like to match the child nodes of a block in a single capture. Thus, I'm exposing statement_list.

Currently, if we match a block we also get the braces { }.

By exposing statement_list, we can match the content without the braces. Below is a local playground with the modifications.

Checklist:

• [ ] All tests pass in CI.
• [X] There are sufficient tests for the new fix/feature.
• [X] Grammar rules have not been renamed unless absolutely necessary.
• [X] The conflicts section hasn't grown too much.
• [X] The parser size hasn't grown too much (check the value of STATE_COUNT in src/parser.c).

[dvmarcilio]

Sorry. This PR was meant to be made into our repo fist. We'll discuss it internally and probably submit it here as well.