feat: new mime-ext plugin

mime-ext.yazi/LICENSE

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+MIT License
+
+Copyright (c) 2023 yazi-rs
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

mime-ext.yazi/README.md

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+# mime-ext.yazi
+
+A _common_ file type MIME-type library specifically designed for Yazi. Ensuring strict compliance with IANA-registered media types is not its primary goal.
+
+It is still in a very early stage and currently requires the [latest nightly build of Yazi](https://github.com/sxyazi/yazi/releases/tag/nightly).
+
+## Installation
+
+```sh
+ya pack -a yazi-rs/plugins:mime-ext
+```
+
+## Usage
+
+Add this to your `~/.config/yazi/yazi.toml`:
+
+```toml
+[[plugin.prepend_fetchers]]
+id   = "mime"
+if   = "!mime"
+name = "*"
+run  = "mime-ext"
+prio = "high"
+```
+
+## TODO
+
+- Add more file types (PRs welcome!).
+- Allow configuring the plugin and overriding some of its rules.
+- Eliminating `x-` as part of Yazi v0.4 as it's discouraged as per [rfc6838#section-3.4](https://datatracker.ietf.org/doc/html/rfc6838#section-3.4)
+- Compress mime-type tables.