feat(languages): add odin language

[RobWalt]

This commit adds the odin language by using the grammar and highlighting
queries written by MineBills repo.

This commit resolves #2340 by just applying all the changes already
discussed in the issue.

[RobWalt]

• I tested the functionality with the example also located in MineBills repo and it worked on my machine perfectly fine.

[the-mikedavis]

If you run cargo xtask docgen and commit the results it'll clear up the ❌ from the Docs CI

[the-mikedavis]

a few suggested changes here to bring the captures in line with the ones helix uses: https://github.com/helix-editor/helix/blob/f1a77370cf679eb0f3a58cfb12deec8ff7fc6325/book/src/themes.md#syntax-highlighting

[RobWalt]

Hey, I just looked into your review. Sorry for adding the queries so carelessly. I think I understand the purpose of the file a bit better now. All of your suggested changes make sense.

[the-mikedavis]

No worries, queries typically need a bit of tuning anyways 😄

[the-mikedavis]

Looks good. Thanks!

[spindlebink]

Highlighting still isn't working for me, although it seems like Helix is recognizing .odin files correctly and Helix lists the Odin grammar as being both fetched and compiled. Also, I'm not aware of an explicit Odin styleguide, but the Odin project itself uses tabs for indentation, so the default indentation mode should probably be set accordingly.

[the-mikedavis]

Highlighting still isn't working for me

Check out hx --health odin. If it shows that you don't have highlight queries then you'll need to link your runtime directory:

helix/README.md

Lines 52 to 55 in 7b287f6

	| OS | command |
	|-----------|-----------|
	|windows |`xcopy runtime %AppData%/helix/runtime`|
	|linux/macos|`ln -s $PWD/runtime ~/.config/helix/runtime`

the Odin project itself uses tabs for indentation

Would you like to submit a PR to change it? If Odin itself uses tabs it probably makes sense to set tabs as the default (and then it can be overridden on a per-project basis with #1249).

[spindlebink]

Linking worked, thanks! Also opened a PR regarding tabs/spaces #2464.