Merge branch 'feature/transaction-metadata' of https://github.com/mloit/web3swift into feature/transaction-metadata

* 'feature/transaction-metadata' of https://github.com/mloit/web3swift:
  update Oracle to use the new metadata struct
  Back out the workaround implemented tor gasPrice on EIP-1159 transactions
  Add the new metadata struct to EthereumTransaction
  Create EthereumMetadata struct and add it to the project

Author: mloit