Handle TODOs for upload/download bot

[teresaqhoang]

### Tasks
- [ ] Test Upload a bot in SimplifiedNewBotMenu
- [ ] Add loading indicators on download bot
- [ ] Add strong typing
- [ ] Change from MemoryQueryResult to MemoryRecord
- [x] Address TODOs in BotController

[crickman]

This has come within the scope of semantic-memory integration.