[vim/vim] runtime(zip)!: Customizable zip/unzip commands (PR #20832)

I'd like to change another program other than `zip`/`unzip` to open a zip file such as `7z`.
According to the [doc](https://github.com/vim/vim/blob/975e191dc817d8d00abca7197c4529a417c2f805/runtime/doc/pi_zip.txt#L51:L66), I changed the global variable `g:zip_unzipcmd` in my `.vimrc`:

```vim
let g:zip_unzipcmd = "7z"
```

It didn't work. This is because this plugin is primarily only for these two `zip` and `unzip` binary executable files, with some CLI options hard encoded. For example, [this below codes in `runtime/autoload/zip.vim`](https://github.com/vim/vim/blob/975e191dc817d8d00abca7197c4529a417c2f805/runtime/autoload/zip.vim#L252):
```vim
let gnu_cmd = "keepj sil r! " . g:zip_unzipcmd . " -Z1 -- " . s:Escape(a:zipfile, 1)
```

**In this pr, these hard coded options are eliminated, so that users can choose their program to open `.zip` files.**
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20832

-- Commit Summary --

  * runtime(zip)!: Customizable zip/unzip commands

-- File Changes --

    M runtime/autoload/zip.vim (78)
    M src/testdir/test_plugin_zip.vim (20)

-- Patch Links --

https://github.com/vim/vim/pull/20832.patch
https://github.com/vim/vim/pull/20832.diff

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