Add autocomplete for some fields

### Problem

Some names/locations are reoccurring. Not with enough regularity to set a "monthly", but half our calendar entries are to see health professionals (with reoccurring names and addresses), and inputting address is a necessity with our faulty memory... but a slog.

### Proposal

Save some fields:
-Name
-Address
-Notice maybe?
-Associated calendar maybe?

When user focus the entry field for the name, suggest the five or ten last used ones that matches any input (all if no input)
When user selects one, prefill address, notice(?), set associated calendar(?)

I can try a draft code for this if there is interest, but do not want to spend effort if there is none.
Doubt gsettings can save arrays of arrays so a storage with json or sql would be "cleaner"

### Prior Art (Optional)

_No response_