Pull commit interval config from contract

[Salka1988]

I've removed the commit_interval from our configuration. Instead, the committee will now use the interval set in the state contract directly.

• Added BLOCKS_PER_COMMIT_INTERVAL() external view returns (uint256) function to retrieve the commit interval from the contract.
• Extended the Contract trait with fn commit_interval(&self) -> Result<std::num::NonZeroU32>.
• Updated code to utilize the new commit_interval function.
• Added setters to the Config structure.