feat(plugins): add universalarchive plugin to conveniently compress files (#6846)

Co-authored-by: Marc Cornellà <marc.cornella@live.com>

plugins/universalarchive/README.md

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+# universalarchive plugin
+
+Lets you compress files by a command `ua <format> <files>`, supporting various
+compression formats (e.g. 7z, tar.gz, lzma, ...).
+
+To enable it, add `universalarchive` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... universalarchive)
+```
+
+## Usage
+
+Run `ua <format> <files>` to compress `<files>` into an archive file using `<format>`.
+For example:
+
+```sh
+ua xz *.html
+```
+
+this command will compress all `.html` files in directory `folder` into `folder.xz`.
+
+This plugin saves you from having to remember which command line arguments compress a file.
+
+## Supported compression formats
+
+| Extension        | Description                    |
+|:-----------------|:-------------------------------|
+| `7z`             | 7zip file                      |
+| `bz2`            | Bzip2 file                     |
+| `gz`             | Gzip file                      |
+| `lzma`           | LZMA archive                   |
+| `lzo`            | LZO archive                    |
+| `rar`            | WinRAR archive                 |
+| `tar`            | Tarball                        |
+| `tbz`/`tar.bz2`  | Tarball with bzip2 compression |
+| `tgz`/`tar.gz`   | Tarball with gzip compression  |
+| `tlz`/`tar.lzma` | Tarball with lzma compression  |
+| `txz`/`tar.xz`   | Tarball with lzma2 compression |
+| `tZ`/`tar.Z`     | Tarball with LZW compression   |
+| `xz`             | LZMA2 archive                  |
+| `Z`              | Z archive (LZW)                |
+| `zip`            | Zip archive                    |
+| `zst`            | Zstd archive                   |
+
+See [list of archive formats](https://en.wikipedia.org/wiki/List_of_archive_formats) for more information regarding the archive formats.