Activities field on the activity recording model should be searchable and ordered

[Nicca42]

Activities field on the activity recording model should be searchable and ordered

Acceptance criteria

• The activities are ordered alphabetically
• When the prescription field is clicked, the drop-down should drop as normal, and a search bar should appear where the user clicked.
• Selecting the drop-down should make a keyboard appear when on a tablet
• Typing in the field will highlight the activity that matches what is in the search bar
• If enter is pressed, the highlighted activity will be added