fix: eip712 rlp encoding fix

[ischasny]

Update Paymaster Params and its rlp encoding to be inline with zksync-era

[IAvecilla]

@ischasny Looks good!
Could we apply the formatter and also remove the unused imports in the paymaster_params.rs file? It's not necessary for the lint job in the CI to pass, as there are other unrelated issues to fix.

[ischasny]

@ischasny Looks good! Could we apply the formatter and also remove the unused imports in the paymaster_params.rs file? It's not necessary for the lint job in the CI to pass, as there are other unrelated issues to fix.

Hi @IAvecilla - thank you for review, done!