fix: multisig tx details

[fmorency]

Retrieve multisig transaction details from current and legacy networks.

This PR support N legacy networks.

Any multisig transaction in a pending state on a legacy network will need to be re-created on the new network. Those pending multisig will remain pending indefinitely, as we do not want to modify the legacy storage.

Future work:

• Add a label identifying which network a transaction belongs to.
• Add more (e2e) tests

I also did some small refactoring.

@stanleyjones is there a reason why we're not using more native many-js types in Alberto, e.g., we're using string instead of MultisigTransactionState. I saw this behavior often in Gwen/Alberto and was wondering what the reason was.

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