feat: mask out comments beginning with spellchecker:ignore

[grantlemons]

Still needs some tests. I'm not sure this is the cleanest way to accomplish this, but I based it on a comment @elijah-potter once made about something similar (I think shebangs).

[grantlemons]

Closes #825

[grantlemons]

Still needs some tests. I'm not sure this is the cleanest way to accomplish this, but I based it on a comment @elijah-potter once made about something similar (I think shebangs).

I was wrong, it was my own suggestion lol, I like elijah's better (making a new masker and wrapping the treesitter masker) so I'll mark this as draft for the time being.

[grantlemons]

I made it ignore on

spellchecker:ignore
spellchecker: ignore
spellcheck:ignore
spellcheck: ignore
cspell:ignore
cspell: ignore
harper:ignore
harper: ignore

These are all done with individual .contains() on the text of the comment, so I'm sure there's a better way to do this.

[elijah-potter]

I like this implementation, but I'd like some more test-driven assurance that works as expected. Could you add a couple of integration tests (in harper-comments/tests/language_support.rs) that make sure it works in several contexts and languages?

They can be variations of the same fundamental information, but with different file extensions and with the ignore instruction in different places.