[Feature] `:Rocks ts` commands

[mrcjkb]

• ts add - enable auto highlight and install (if bang). No arg gets the parser for the current file type
• ts prune - disable auto highlight and uninstall. Don't uninstall if bang?

[Freed-Wu]

Perhaps we can have a command Rocks ts update to get all tree-sitter-XXX to add them to rocks.toml easily.

require("rocks.fzy").fuzzy_filter("tree-sitter-", vim.tbl_keys(require("rocks.cache").try_get_rocks()))