SendMessages retry refactor

[liorzilp]

Overview

There may be many failures when bringing up a connection with a rollapp until the state is accepted and finalized. The messages should be sent only when the dymension hub finalizes the corresponding state to which the message belongs.

Refactor

Currently, SendMessages running endless retries, messages should be sent only for finalized states. This behavior was changed by #9.
Refactor SendMessages such that it will send messages only when they got finalized.
The code should be replaced with a more robust and go-style retry mechanism.