Perform NIP-05 verification upon profile load

[sondreb]

Some users have hundreds if not thousands of following and we can't do NIP-05 validation for all of them during import. We also want to validate NIP-05 once in a while for validitiy.

• Store which NIP-05 was used on the user last time they where validated.
• If the profile has a new NIP, show some visual indicator that makes users aware that "this user has changed their NIP-05".
• Validate the NIP-05 against web server when loading profile and store date when retrieved.
• Validate again if X amount of time, perhaps 5 hours or 24 hours or 48 hours?