add autocomplete

[gkuznik]

Type of change(s)

• Bug fix
• Feature / enhancement
• Infrastructure / tooling (CI, build, deps, tests)
• Documentation

What changed and why

• replace the text edit with an autocomplete field
• add completion logic in EventActivity

Tests performed

• create event with all reminders, new event type, colour, description, location, availability
• add new event, input two characters of old title, select event
• all fields copied from old event

After preview

Closes the following issue(s)

• Closes Add Event Autocomplete Based on Previously Entered Titles (like Samsung Calendar) #579

Checklist

• I read the contribution guidelines.
• I manually tested my changes on device/emulator (if applicable).
• I updated the "Unreleased" section in CHANGELOG.md (if applicable).
• I have self-reviewed my pull request (no typos, formatting errors, etc.).
• All checks are passing.

I copied almost all fields, maybe not all should be assigned?
#393 is now trivial, I can make a follow-up PR if you want

[naveensingh]

Please review the contribution guidelines. Issues labelled needs triage are not yet accepted or ready for development.

[gkuznik]

Ok, so I can do #393 already and for this I just wait?

[naveensingh]

I'll check this soon.