Low data mode tracking

[alltheseas]

• [ ] #1838 (it would be useful to understand data demands & behavior - note loading, PFP, profile banner, media, one relay, few relays, many relays etc)
• [ ] https://github.com/damus-io/damus/issues/919 (validated)
• [ ] #2098 (planned)
• [ ] https://github.com/damus-io/damus/issues/2227 (unvalidated)
• [ ] too many relays warning https://github.com/damus-io/damus/issues/544
• [ ] time/MB remaining UI https://github.com/damus-io/damus/issues/2485

tangential

• [ ] embed Tor https://github.com/damus-io/damus/issues/2465

[alltheseas]

added embed tor to low data mode tracker as bonus points