Re-enable language plugin functionality with some fixes (#7105)

Part of https://github.com/zed-industries/zed/issues/7096

* [x] Load all queries for language plugins, not just highlight query
* [x] Auto-reload languages when changing the `plugins` directory
* [x] Bump Tree-sitter for language loading and unloading fixes
* [x] Figure out code signing

Release Notes:

- N/A

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Co-authored-by: Antonio <antonio@zed.dev>
Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>