`WebEthTx` class

[spacesailor24]

• Should create an @ethereumjs/tx transaction instance using provided transaction object
• Static methods
  • The below methods should support a user defined method being passed as an argument to override default way of determination
    • detectTransactionType method
    • validateTransaction method
    • fillTransaction method
• Should have setting in Web3Context for default transaction type when detectTransactionType is inconclusive

[mconnelly8]

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