This PR adds the initial support for loading extensions in Zed.
### Extensions Directory
Extensions are loaded from the extensions directory.
The extensions directory has the following structure:
```
extensions/
installed/
extension-a/
grammars/
languages/
extension-b/
themes/
manifest.json
```
The `manifest.json` file is used internally by Zed to keep track of
which extensions are installed. This file should be maintained
automatically, and shouldn't require any direct interaction with it.
Extensions can provide Tree-sitter grammars, languages, and themes.
Release Notes:
- N/A
---------
Co-authored-by: Marshall <marshall@zed.dev>
Based on the great work in
https://github.com/zed-industries/zed/pull/7130 , now sends this data
```
[crates/lsp/src/lsp.rs:588] ClientInfo { name: name.to_string(), version: Some(version.to_string()) } = ClientInfo {
name: "Zed Dev",
version: Some(
"0.122.0",
),
}
```
with every LSP server initialization.
Release Notes:
- Added Zed name and version to LSP InitializeParams requests
This commit mostly fixes invalid URLs in docstrings. It also
encapsulates crates we reexport (serde stuff + linkme) into a public
module named "private" in order to reduce the API surfaced through docs.
Moreover, I fixed up a bunch of crates that were pulling serde_json in
through gpui explicitly instead of using Cargo manifest.
Release Notes:
- N/A
