Casper Multisig Management

[zie1ony]

Develop a code that can adjust the association keys as a wasm. Add new commands to cargo-odra to have full CLI interface. Provide an example of combining signatures.

[teon]

Ideal would be to have ability to:

• create wallet multisig with various weights (relevant for threshold, like wallet 1 - 20% Wallet 2 - 35%, etc) and threshold that takes weights into account
• sign a transaction using multisig

For sure core in odra but would be great to also have a cmd line tool as example of the above.