Keep track of addresses we sent to

[beeman]

Describe the solution you'd like
We need a way to keep track to which addresses we send funds so that we can confirm the user if this is a wallet they interacted with before, or not.

Additional context

This is how Backpack shows the confirmation.

• finalize specs
• list of 'know wallets' can be either
  • the stored transactions (Create a transaction table to store transactions we sent #366)
  • the bookmarked address (Add bookmarks to accounts #247)

[HongThaiPham]

Do you think we should have an internal database for it?

[tobeycodes]

Do you think we should have an internal database for it?

I think it depends. This is probably where using a sync engine makes the most sense. So we get the best of both worlds from the RPC and DB cache