Add OCaml support

[huwaireb]

👋

This pull request implements support for the OCaml Language.

Additions

• [x] tree-sitter-ocaml grammar
• [x] Highlight, Indents, Outline queries
• [x] A new file icon for .ml(i) files. Based on ocaml/ocaml-logo
• [x] LSP Integration with ocaml-language-server
• [x] Completion Labels
• [x] Symbol Labels

Bug Fixes

• [x] Improper parsing of LSP headers.

Missing [will file a separate issue]

• Documentation on completionItem, requires: completionItem/resolve with support for documentation as a provider.

Screenshots

Zed

Release Notes:

• Added OCaml Support (#5316).

[!NOTE] Partially completes #5316 To complete #5316:

1. addition of a reason tree-sitter grammar.
2. opam/esy integration, however it may be better as it's own plugin.

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[huwaireb]

@cla-bot check

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[huwaireb]

I've pushed a commit to handle Content-Type, the change felt too small for a new PR. The LSP should work fine now.

[SomeoneToIgnore]

Hello, could you also add a docs entry please, into the https://github.com/zed-industries/zed/tree/main/docs/src/languages list.

[huwaireb]

rebased, should be ready now 🪷

[huwaireb]

I'm curious if it's fine for me to document use instructions across different package managers (nix/esy/opam) in thedocs/src/languages/ocaml.md?

The lack of direct support for the officially supported package manager (opam) would require a similar workflow to using Nix with any other language. That is, opening Zed from a terminal where your active project sandbox (switch) is activated with ocamllsp installed.

I would've loved to implement it into Zed to make it more seamless, but I guess that would set precedent for other "obscure" languages that it's fine, as opposed to going through the soon to be plugin route.

[SomeoneToIgnore]

Go test started to fail after a different commit in main and I'll check that, but this PR has nothing to do with it, optimistically merging.

Thank you for the fixes!