Implement Bitcoin liqudity transfer event handler

[mpetrun5]

We want to able to move liqudity when the admin multisig requests it.
To make this easier, an admin event triggered on an EVM chain (same contract as FROST keygen contract) will
send a transfer from the target address to the new one.

Implementation details

• add move liqudity event and function to the keygen contract
• implement a move liqudity event handler that will create a transfer on the Bitcoin network that moves the liqudity with the existing key

Testing details

• unit tests

Acceptance Criteria

• liquidity can be moved using the EVM multisig address