chore: Extract languages from zed crate (#8270)

- Moves languages module from `zed` into a separate crate. That way we
have less of a long pole at the end of compilation.
- Removes moot dependencies on editor/picker. This is totally harmless
and might help in the future if we decide to decouple picker from
editor.

Before:
```
Number of crates that depend on 'picker' but not on 'editor': 1
Total number of crates that depend on 'picker': 13
Total number of crates that depend on 'editor': 30
```
After:
```
Number of crates that depend on 'picker' but not on 'editor': 5
Total number of crates that depend on 'picker': 12
Total number of crates that depend on 'editor': 26
```
The more crates depend on just picker but not editor, the better in that
case.

Release Notes:

- N/A

crates/languages/src/ocaml-interface/brackets.scm

@@ -0,0 +1,6 @@
+("(" @open ")" @close)
+("{" @open "}" @close)
+("<" @open ">" @close)
+
+("sig" @open "end" @close)
+("object" @open "end" @close)

crates/languages/src/ocaml-interface/config.toml

@@ -0,0 +1,14 @@
+name = "OCaml Interface"
+grammar = "ocaml_interface"
+path_suffixes = ["mli"]
+block_comment = ["(* ", "*)"]
+autoclose_before = ";,=)}"
+brackets = [
+  { start = "{", end = "}", close = true, newline = true },
+  { start = "<", end = ">", close = true, newline = true },
+  { start = "[", end = "]", close = true, newline = true },
+  { start = "(", end = ")", close = true, newline = true },
+  { start = "sig", end = " end", close = true, newline = true },
+  # HACK: For some reason `object` alone does not work
+  { start = "object ", end = "end", close = true, newline = true },
+]

crates/languages/src/ocaml-interface/highlights.scm

@@ -0,0 +1 @@
+../ocaml/highlights.scm

crates/languages/src/ocaml-interface/indents.scm

@@ -0,0 +1,21 @@
+[
+  (type_binding)
+
+  (value_specification)
+  (method_specification)
+
+  (external)
+  (field_declaration)
+] @indent
+
+(_ "<" ">" @end) @indent
+(_ "{" "}" @end) @indent
+(_ "(" ")" @end) @indent
+
+(_ "object" @start "end" @end) @indent
+
+(signature
+  "sig" @start
+  "end" @end) @indent
+
+";;" @outdent

crates/languages/src/ocaml-interface/outline.scm

@@ -0,0 +1,48 @@
+(module_type_definition
+  "module" @context
+  "type" @context
+  name: (_) @name) @item
+
+(module_definition
+    "module" @context
+    (module_binding name: (_) @name)) @item
+
+(type_definition
+    "type" @context
+    (type_binding name: (_) @name)) @item
+
+(class_definition
+    "class" @context
+    (class_binding
+      "virtual"? @context
+      name: (_) @name)) @item
+
+(class_type_definition
+  "class" @context
+  "type" @context
+  (class_type_binding
+    "virtual"? @context
+    name: (_) @name)) @item
+
+(instance_variable_definition
+  "val" @context
+  "method"? @context
+  name: (_) @name) @item
+
+(method_specification
+  "method" @context
+  "virtual"? @context
+   (method_name) @name) @item
+
+(value_specification
+    "val" @context
+    (value_name) @name) @item
+
+(external
+  "external" @context
+  (value_name) @name) @item
+
+(exception_definition
+    "exception" @context
+    (constructor_declaration
+      (constructor_name) @name)) @item