Ensure that we can re-broadcast transactions

[bonomat]

If a transaction was not included yet in the mempool, the app/coordinator should try to rebroadcast the transaction, e.g. on restart.

Alternatively, we could store all broadcasted transactions in the DB and do it manually when needed.

[bonomat]

Critical because if we do not do this yet we might lose the posibility to broadcast old transactions. Our logs get pruned after 30 days.

[holzeis]

@bonomat is this really fixed? your change only stores the raw transaction but does not try to re-broadcast them, or does it?

[bonomat]

Correct. I descoped this part and only focused on storing it so that we can manually re-broadcast when needed.