[SHIP-1501] Enable X Layer

[friedemannf]

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Below is a summarization created by an LLM (gpt-4-0125-preview). Be mindful of hallucinations and verify accuracy.

Why

The changes integrate support for a new blockchain client, XLayer, into the system. This includes its incorporation into known networks and the creation of corresponding client classes for single and multi-node setups.

What

• blockchain/known_networks.go
  • Added XLayerClientImplementation to the list of client implementations.
  • Implemented the wrapping of single and multi-node clients for XLayer in wrapSingleClient and wrapMultiClient functions respectively.
• blockchain/xlayer.go
  • Introduced new file defining XLayerClient and XLayerMultinodeClient structs, extending single and multi-node Ethereum client capabilities to the XLayer network.
• networks/known_networks.go
  • Added configuration for XLayerSepolia and XLayerMainnet within the MappedNetworks map and as standalone EVMNetwork instances, setting up network parameters for the XLayer blockchain on Sepolia testnet and mainnet.