Add on chain for federations

[AnthonyRonning]

TODO:

• Withdrawals
• Frontend needs to allow withdrawals from fedimint balance
• Change APIs to account for withdraw pending
• Figure out max send situation
• Monitor eventual TXID for confirmations (fedimint doesn't care about tracking it)
• Lots of TODOs in the on chain cleanup in federation.rs
• pull activity list for on chain addresses
• Refreshing doesn't show on chain history
• activity item for on chain deposit doesn't show additional info
• tests for activity item & indexing
• subscribe to pending on chain operations
• show payment details on the onchain send screen when the link is clicked
• handle tiny amounts properly if they are attempted to be paid

[AnthonyRonning]

This works as long as you don't try to send max. Still a lot of code to clean up and want to do some tests.

There's some possible ideas for frontend changes too but will think about them more.

• we should say not to send more than once to the address
• we should tell them it requires 10 confs for deposits
• we should probably show a fee to confirm before sending

[AnthonyRonning]

I want to do some tests for the activity item stuff but this is ready for review

[benthecarman]

overall looks good

[AnthonyRonning]

READY

[benthecarman]

two small things, otherwise LGTM, nice job

[benthecarman]

🚢 it