Get - Get config value by key.

GetBlockConfirmations - Number of block confirmations required before considering that block to be finalized, and can be persisted in a permanent data store.

GetBlockNumberRange - Returns how many blocks can be queried at a time when performing range based queries from client side.

GetConcurrencyFactor - Reads concurrency factor specified in `.env` file, during deployment and returns that number as unsigned integer.

GetSnapshotFile - Reading snapshot file name from config file, if not provided, `snapshot.bin` is used as default file name.

GetTimeRange - Returns what's the max time span that can be used while performing query from client side, in terms of second.

Read - Reading .env file content, during application start up.