Add an extensions installation view (#7689)

This PR adds a view for installing extensions within Zed.

My subtasks:

- [X] Page Extensions and assign in App Menu
- [X] List extensions 
- [X] Button to Install/Uninstall
- [x] Search Input to search in extensions registry API
- [x] Get Extensions from API
- [x] Action install to download extension and copy in /extensions
folder
- [x] Action uninstall to remove from /extensions folder
- [x] Filtering
- [x] Better UI Design

Open to collab!

Release Notes:

- Added an extension installation view. Open it using the `zed:
extensions` action in the command palette
([#7096](https://github.com/zed-industries/zed/issues/7096)).

---------

Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
Co-authored-by: Marshall <marshall@zed.dev>
Co-authored-by: Carlos <foxkdev@gmail.com>
Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>
Co-authored-by: Max <max@zed.dev>

crates/zed/Cargo.toml

@@ -23,7 +23,7 @@ assets.workspace = true
 assistant.workspace = true
 async-compression.workspace = true
 async-recursion = "0.3"
-async-tar = "0.4.2"
+async-tar.workspace = true
 async-trait.workspace = true
 audio.workspace = true
 auto_update.workspace = true
@@ -45,6 +45,7 @@ diagnostics.workspace = true
 editor.workspace = true
 env_logger.workspace = true
 extension.workspace = true
+extensions_ui.workspace = true
 feature_flags.workspace = true
 feedback.workspace = true
 file_finder.workspace = true