Format API results inside _wrap* methods

[ly0va]

There are 4 wrapping methods in AbstractProvider:

• _wrapBlock
• _wrapLog
• _wrapTransactionReceipt
• _wrapTransactionResponse

For some reason, formatTransactionResponse was not being called in _wrapTransactionResponse, although the analogous functions were being called in other wrapping methods.

Also, for some reason, formatting functions were being called on the arguments of wrapping methods before being passed in, even though they are called inside as well.

This PR fixes the inconsistencies.

The argument for formatting functions to be called inside wrapping methods is that if we want to override the formatters in the derived Provider class (say, if a network has extra fields in Block or TransactionReceipt), it is much easier to do so by overriding wrapping methods than by overriding every method that calls wrapping methods.

[ricmoo]

This has been merged in v6.2.0.

Thanks! :)