Add OCaml support (#6929)

This pull request implements support for the [OCaml
Language](https://ocaml.org/).

### Additions
- [x]
[tree-sitter-ocaml](https://github.com/tree-sitter/tree-sitter-ocaml)
grammar
- [x] Highlight, Indents, Outline queries
- [x] A new file icon for .ml(i) files. Based on
[ocaml/ocaml-logo](https://github.com/ocaml/ocaml-logo/blob/master/Colour/SVG/colour-transparent-icon.svg)
- [x] LSP Integration with
[ocaml-language-server](https://github.com/ocaml/ocaml-lsp)
- [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

<details><summary>Zed</summary>
<img width="1800" alt="Screenshot 2024-02-01 at 03 33 20"
src="https://github.com/zed-industries/zed/assets/69181766/e17c184e-203e-40c3-a08f-4de46226b79c">
</details>

Release Notes:
- Added OCaml Support
([#5316](https://github.com/zed-industries/zed/issues/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.

crates/zed/src/languages.rs

@@ -25,6 +25,7 @@ mod json;
 mod language_plugin;
 mod lua;
 mod nu;
+mod ocaml;
 mod php;
 mod purescript;
 mod python;
@@ -299,6 +300,16 @@ pub fn init(
         tree_sitter_nu::language(),
         vec![Arc::new(nu::NuLanguageServer {})],
     );
+    language(
+        "ocaml",
+        tree_sitter_ocaml::language_ocaml(),
+        vec![Arc::new(ocaml::OCamlLspAdapter)],
+    );
+    language(
+        "ocaml-interface",
+        tree_sitter_ocaml::language_ocaml_interface(),
+        vec![Arc::new(ocaml::OCamlLspAdapter)],
+    );
     language(
         "vue",
         tree_sitter_vue::language(),