LoadConfiguration attempts to create a new Configuration using the ENVs in the environment.

DefaultOperaURL is the default URL for a running Opera node.

Mainnet is the Fantom Mainnet.

MiddlewareVersion is the version of rosetta-fantom.

ModeEnv is the environment variable read to determine mode.

NetworkEnv is the environment variable read to determine network.

Offline is when the implementation is not permitted to make outbound connections.

Online is when the implementation is permitted to make outbound connections.

OperaArgsEnv is an environment variable to pass arguments to the Opera process.

OperaEnv is an optional environment variable used to connect rosetta-fantom to an already running Opera node.

PortEnv is the environment variable read to determine the port for the Rosetta implementation.

SkipAdminEnv is an optional environment variable to skip RPC `admin` calls which are typically not supported by hosted node services.

Testnet is the Fantom Testnet.

Configuration determines how.

Mode is the setting that determines if the implementation is "online" or "offline".