Introduce `/symbols` command in assistant panel (#14360)

Release Notes:

- Added `/symbols` command in assistant panel.

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Co-authored-by: Antonio <antonio@zed.dev>
Co-authored-by: Antonio Scandurra <me@as-cii.com>
Co-authored-by: Nathan <nathan@zed.dev>
98b95d9a51Max Brunsfeld committed on 7/15/2024, 9:51:32 AM· committed by GitHubparentdecdd3b
6 files changedLine totals unavailable