Organize lib functions

[AmeanAsad]

Description:

The utils library is starting to grow, we should organize the functions we have into separate modules. A rough suggestion of these modules could be:

• multisig_utils handles multisig functions.
• wallet_utils handles wallet functions such as address conversion, address derivation from private keys, signing messages, etc.
• transaction_utils handles transaction related functions such as connecting to an rpc provider, sending a transaction, getting gas info, etc.
• ledger_utils handles connections with the ethereum and filecoin ledger apps.