fix: add debug_traceTransaction RPC method

[tcoulter]

Two important notes:

• The port does not include code from the original version meant for forking. Those changes will need to be added when forking is added to ts.
• There were a few tests in the old version that appeared to do the same thing multiple times, like setting a value. It didn't appear as though each repetition was a novel test, so I instead opted to merge what I thought was novel into a single test. Happy to add things back if the test is more nuanced than it appears.

Note that I copied over many of the original comments to this version. I also added some comments of my own.

[tcoulter]

Ah, TODO before merging: I need to test what happens on a revert and see if that's handled correctly. Don't merge yet - I'll add that.

[gnidan]

Here's a few comments

[tcoulter]

This is merge'able now! \o/

The biggest changes came from the memory optimization work, and the TraceData and TraceStorageMap objects. These objects help use objects to store data used to create the trace, rather than copying thousands of strings around. In our tests which runs a loop in Solidity 100 times, these optimizations were able to reduce the number of objects used to create the trace by 47% (22844 objects vs the original count of 43693).

This needs some testing against more intense transactions, but so far basic testing with truffle-debugger is A-Ok. Would love more feedback if any!