handle maps with multiple or single entries from Baloo

Summary:
Handle maps which may contain multiple entries with the same key.
Bumps frameworks to 5.58. Equivalent to D20739.

Reviewers: #dolphin, elvisangelaccio, bruns

Reviewed By: #dolphin, elvisangelaccio, bruns

Subscribers: kfm-devel

Tags: #dolphin

Differential Revision: https://phabricator.kde.org/D21157