script to Generate `MsgCreateFinalityProvider` easier

[RafilxTenfen]

Receive the FP json registration from first registration phase and some parameters to generate the signed msg

[RafilxTenfen]

shell script to facilitate the creation of signed msg based on previous json FP information - https://github.com/babylonchain/pm/commit/c5a1afe01a7892be8960dd5d68c6bcecab1aa2f9