NewAPIClient initialize most of avalanchego apis.

NewEthClient mainly takes ip/port info for usage in future calls Connection can't be initialized in constructor because node is not ready when the constructor is called It follows convention of most avalanchego api constructors that can be called without having a ready node.

NewEthClientWithChainID creates an EthClient initialized to connect to ipAddr/port and communicate with the given chainID.

APIClient gives access to most avalanchego apis (or suitable wrappers).

Issues API calls to a node TODO: byzantine api.

Returns a new API client for a node at [ipAddr]:[port].