Refactor package loading process w/ Provider pattern

[Noxsios]

Describe what should be investigated or refactored

The current loading process of a Zarf package is brittle and contains far too many code branches. Refactoring into a Provider pattern will allow for a common interface system to cleanly abstract away the different loading methods (via tarball, HTTP(S), OCI, etc...)

[Noxsios]

Linking as tech debt to be refactored from #1770:

	if alreadyExtracted && pathsToCheck == nil {
		paths, err := utils.RecursiveFileList(p.tmp.Base, nil, false)
		if err != nil {
			return fmt.Errorf("unable to get a list of files in the package: %w", err)
		}
		for _, path := range paths {
			pathsToCheck = append(pathsToCheck, strings.TrimPrefix(path, p.tmp.Base+string(os.PathSeparator)))
		}
	}