Eth RPC 1559 support for private transactions

[siladu]

Following #769, this issue is to support 1559 in private transactions via eea_sendTransaction.

Draft PR already underway: #838 #950

A web3j bug was found which prevented EIP-1559 from being decoded which is why this issue was split out:
https://github.com/web3j/web3j/blob/2ad9a8b4b9411de13c6d09e8392a51213d8160f0/eea/src/main/java/org/web3j/protocol/eea/crypto/PrivateTransactionDecoder.java#L35-L39
Although the delegation to TransactionDecoder.decode() covers the 1559 decoding routine, the RlpDecoder.decode() method higher up relies on the all important stripping of the first byte happening before it is called...
final byte[] encodedTx = Arrays.copyOfRange(transaction, 1, transaction.length);

Tasks

• Add additional fields to EthSendTransactionJsonParameters for maxFeePerGas and maxPriorityFeePerGas
• Update EeaPrivateTransaction and BesuPrivateTransaction to create 1559 transactions and be used in the encoding
• Update web3j PrivateTransactionDecoder to work for 1559
• Integration/Acceptance tests:
  • eea_sendTransaction
    • EeaPrivateTransactionTest
    • 1559 version of SigningEeaSendTransactionIntegrationTest.signSendTransaction for EeaPrivateTransaction
    • 1559 version of SigningEeaSendTransactionIntegrationTest.signSendTransactionWithPrivacyGroupId for BesuPrivateTransaction

[jframe]

Blocked on changes in web3j to support encoding of EIP-1559 private transactions

[siladu]

Web3j issue has been filed for this LFDT-web3j/web3j#1966

[NickSneo]

PR for Web3j private 1559 transaction - LFDT-web3j/web3j#1980

[siladu]

LFDT-web3j/web3j#1980 merged, no longer blocked.

Latest PR is #950