feat: new mactag plugin

Co-authored-by: Anirudh Gupta <146579014+AnirudhG07@users.noreply.github.com>

mactag.yazi/README.md

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+# mactag.yazi
+
+Bring macOS's awesome tagging feature to Yazi! The plugin it's only available for macOS just like the name says.
+
+Authors: [@AnirudhG07](https://github.com/AnirudhG07), and [@sxyazi](https://github.com/sxyazi)
+
+## Installation
+
+Install the plugin itself, and [jdberry/tag](https://github.com/jdberry/tag) used to tag files:
+
+```sh
+ya pack -a yazi-rs/plugins#mactag
+brew update && brew install tag
+```
+
+## Setup
+
+Add the following to your `~/.config/yazi/init.lua`:
+
+```lua
+require("mactag"):setup()
+```
+
+And register it as fetchers in your `~/.config/yazi/yazi.toml`:
+
+```toml
+[[plugin.prepend_fetchers]]
+id   = "mactag"
+name = "*"
+run  = "mactag"
+
+[[plugin.prepend_fetchers]]
+id   = "mactag"
+name = "*/"
+run  = "mactag"
+```
+
+## Usage
+
+This plugin also provides the functionality to add and remove tags. Add following keybindings to your `~/.config/yazi/keymap.toml` to enable it:
+
+```toml
+[[manager.prepend_keymap]]
+on   = [ "t", "r" ]
+run  = 'plugin mactag --args="add Red"'
+desc = "Tag selected files with red"
+
+[[manager.prepend_keymap]]
+on   = [ "t", "R" ]
+run  = 'plugin mactag --args="remove Red"'
+desc = "Remove red tag from selected files"
+```
+
+`Red` can be any tag name you like. To add/remove multiple tags at once, use a comma (`,`) to separate them, like `Red,Yellow`.