Create sending and receiving chain client classes in chain connector

[ishantiw]

Description

Create sending and receiving chain client classes in chain connector that can encapsulate certain functions and RPC names that can improve usability of these clients and simplify it in the plugin class.

We can have a class SendingChainClient and ReceivingChainClient where we can encapsulate certain functions and simply use them like, receivingChainClient.getLastCertificate() sendingChainClient.getOwnAccount()

Acceptance Criteria

• Should have all the unit tests and passing

Additional Information

• https://github.com/LiskHQ/lisk-sdk/pull/8112#discussion_r1114326220

[shuse2]

Closing this issue since this is no longer valid