Add geth's `debug_traceTransaction`

[mrwillis]

Add debug_traceTransaction

Description

debug_traceTransaction is used a lot in different block explorers to trace transactions and provide more metadata on the tx itself. Example:

https://blockscout.com/xdai/mainnet/tx/0x29bc60b639d1f504110637a4f0b5d3e87edc6466797f4332dcd08c5e41677316/internal-transactions

It's a standard geth endpoint and provides similar functionality to parity's trace module. We would be happy to tackle it if given some direction on how to get started!