chore: ensure that slot ticker is not affected by slow scheduled commits

[thlorenz]

• RPC calls might take a long time inside of the tick loop (await)
• we need to avoid them as part of the tick loop

Possible Solution

• this requires having blockhash available sync
• mainnet tx should be done in a separate task

[thlorenz]

This is solved as part of #366 as the committor service runs on a separate thread and we just need to send commit requests to it.