[feat]: load classes generically according to a given pattern

[MatteoVoges]

Description of the feature

Reference: Slack Thread

Usage:

classes:
  - * # (load all classes)
  - clusters.* # (all classes in clusters/ directory
  - dev-* # (all classes with prefix dev- (in all (sub)-directories)

We could extend this request by not just supporting *, but other symbols as well.

Additional context

No response

[github-actions]

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