[SPACES] Add search functionality to spaces list

[abelgardep]

Add search to the spaces list screen so users with several spaces can find the one they want easier...

Available also in the picker

TASKS

• Research (if needed)
• Create branch feature/search_functionality_in_spaces_list
• Development tasks
  • SpacesListFragment
  • FolderPicker
  • ReceiveExternalFiles
• Code review and apply changes requested
• Design test plan
• QA
• Merge branch feature/feature_name into master

PR

• App
• Library (if needed)

[abelgardep]

To take into account when picking a folder:

We show also the personal space with a translatable string Personal not the actual personal space name (username). We would need to distinguish if there is a personal space, and use the translatable string instead of the space name in the filtering.

[michaelstingl]

Only in spaces tab: Similar search/filter input field as in the file list.

To take into account when picking a folder:

We show also the personal space with a translatable string Personal not the actual personal space name (username). We would need to distinguish if there is a personal space, and use the translatable string instead of the space name in the filtering.

Personal could be excluded.

[jesmrec]

Keep Personal as first result in the search. Then the matching results.