Integrates Multi chain config to prover

[lordshashank]

• Configures smart contract flow to handle deals from various chains
• Expects chainId to be sent as bytes through proposal.label
• configures only owner function to populate chain name and address in struct mapped with chainId to make cross chain axelar calls
• In case of native filecoin call it calls mock bridge through IBridgeContract on same chain
• Configures xchain to send chainId in deal label.
• Implements test to check abi encoding and decoding properly for xchain