eopkg4-bin: Add bash/fish/zsh completion

[malfisya]

Please add back bash/fish/zsh completion. So the cli experience will be comparable with eopkg. Is this even possible with the way eopkg4-bin is shipped?
Thanks you.

[malfisya]

I make one for fish (just edited from eopkg), if anyone interested. Just change the file extension to .fish . Put one in completion directory and the other one in functions directory.
eopkg4-bin.txt
__fish_print_eopkg4_packages.txt

[TraceyC77]

I chatted with Joey about this, after discovering we have bash and fish completions, but not zsh
fish

~ ❯❯❯ eopkg it qt6-doc

qt6-docs  (Available Package)  qt6-doctools  (Available Package)

zsh

❯ eopkg it qt6-doc
 -- no matches found --

Currently, the completions live in the bash-completion package, we should move them into eopkg and make them compatible for bash/fish/zsh

packages/b/bash-completion/files/eopkg

As background, I was reminded about this because someone in a KDE Matrix channel was praising the autocomplete functions of zypper. Having this would make eopkg functionality be at the same level as other package managers.