Adding support for multisig wallet API (CIP-106)

[leo42]

WARNING: Untested, this is not yet ready to merge!

I have created the initial layout for this feat, I am opening a pull request to get feedback on the last part I need to complete before staring with testing.

to submit a transaction the developers building against CIP-106 need to attach the script, and the correct Key Hashes as "extra signers"

To do this I have 2 options in mind :
A) create a getRefTransaction() , that will return a tx complete with all the requirements that the dev can then expand on or compose with all the other tx they want to perform.

B) During tx.complete() add a check if the Wallet is of type MultisigApi and attach all the required parameters before finalizing.

B seems to be the path with the least amount of friction as devs would be able to use it almost exactly how they would a regular wallet.

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