feat: add version validation when using set command

[jrodriigues]

Summary

These changes add version validation when using asdf set <plugin> <version> to ensure that only available versions for the plugin are added.
If the version is not part of the available list, the program will fail with a descriptive error message:

❯ ./asdf set ruby 3.9.0
version 3.9.0 is not available for plugin ruby

Fixes: #1983

Other Information

I refactored some existing code from the list command into a new function on the set package since the objective on both commands is the same.

[jrodriigues]

I believe that the new function to retrieve a plugin's available versions makes sense to be a plugin method rather than a standalone function in the set package, so I pushed a change for it.

[Stratus3D]

Thanks for the PR @jrodriigues ! I think this is nice improvement. I think introducing that GetAvailableVersions method was a good idea.

I'd like to merge this but I see it's failing linter and test checks. Can you take a look and fix them?

[jrodriigues]

I have fixed the lint check, but I believe there is something wrong with the test workflow setup.
It's failing because it can't find the list-all callback for the lua plugin (used in the test script), however all tests pass locally (on macOS with lua plugin installed, and list-all callback correctly setup in $HOME/.asdf/plugins/lua/bin/list-all).

I added the error description to the output for debugging, and I believe the error is happening on this line.
Are you able to confirm this somehow?