Adds a possibility to access the first Token of a SyntaxNode.

[suzizecat]

Addressing #900 (and, by extension #898 )

This PR adds the getChildPtr, getTokenPtr, getFirstTokenPtr and getLastTokenPtr functions as well as required backend.

Please let me know how to ensure the tests are still relevant and everything is covered if required.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 48 lines in your changes are missing coverage. Please review.

Project coverage is 93.67%. Comparing base (13e2f12) to head (906bd47).

Additional details and impacted files

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[MikePopoloski]

Nice, lgtm.