Add method to sign a CCU transaction and send it to the other chain

[ishantiw]

Description

Currently we generate CCU params in the chain connector plugin.

• We can create a method named, sendCCU(ccuParams) that will take CCU params and sign the transaction with the privateKey provided in the plugin and send it to another chain.
• We need to accept passphrase similar to forger plugin/report misbehavior plugin to sign the transactions

Acceptance Criteria

• Should have all unit tests for transaction creation complying with transaction schema coming from lisk-sdk
• Should have all the tests to sign a transaction with right key
• Should have all the tests to send a signed transaction to another chain

Additional Information

https://github.com/LiskHQ/lisk-sdk/pull/7438#discussion_r957381939