pulling changes from superkeka(including xlud commits till Feb 18, 2022)

[makinghappen]

Commits seem not to introduce any breaking changes, adding extra functionality like:

1. Make EthereumAddress Comparable StateMutability error when parsing json abi that contains an event simolus3/web3dart#13
2. Make getTransactionByHash nullable Expose number utility functions simolus3/web3dart#3
3. decodeCall Uses the known types of the function parameters to parse them from the binary call data. The reverse of [encodeCall].
4. make rpc call public
5. Add block number to BlockInformation, add BlockInformationWithTransactions, add getBlockByNumberWithTransactions API Documentation on how to create the wallet files, HD wallets simolus3/web3dart#2
6. Fix fetching mempool transactions that do not yet have blockHash
7. Erc20 class support for name, symbol and decimals functions.