feat: add plugin bundles

[vhyrro]

This pull request implements the concept of "plugin bundles", i.e. collections of plugins that can be batched together under a single name (as well as a single configuration file).

Currently bundles take on the following form:

[plugins]
yada = "dev"
yadayada = "dev"
foobar = "dev"

[bundles]
mybundle.items = [
    "yada",
    "yadayada",
    "foobar",
]

If a lua/plugins/mybundle.lua is supplied, the setup will only be executed for that bundle and individual yada.lua, yadayada.lua and foobar.lua files will be ignored (open to discussion on this one).

TODOs:

• [x] Make bundles.mybundle = [] bundles.mybundle.items = [] instead, as we might want to apply extra metadata to a bundle (e.g. the location of the configuration file or config = false).

Open to discussion about any part of the design :)

[github-actions[bot]]

Review Checklist

Does this PR follow the Contribution Guidelines? Following is a partial checklist:

Proper conventional commit scoping:

• For example, fix(installer): some installer bugfix

• [ ] Pull request title has the appropriate conventional commit prefix.

If applicable:

• [ ] Tested
  • [ ] Tests have been added.
  • [ ] Tested manually (steps in PR description).
• [ ] Updated documentation.

[vhyrro]

The CI is tripping but the code looks solid for the time being - tried several edge cases. Might be worth a shot to attach a testing library to this at some point.

[mrcjkb]

The CI is tripping but the code looks solid for the time being - tried several edge cases. Might be worth a shot to attach a testing library to this at some point.

Fixed CI on main