Add support for `eth_sendRawTransactionSync`

[0xRampey]

Is your feature request related to a problem? Please describe.
It'd be nice to have a direct way to benchmark flashblock-aware RPCs using the sync method.
Currently, I believe receipts are gathered at the end of a spam session and use block timestamp which doesn't reflect flashblock timings.

Describe the solution you'd like
Record time for when sendTxnSync calls/returns and add it to the report.

I do have running code for this locally so happy to take this up if its in scope.

[zeroXbrock]

hey @0xRampey thanks for posting! This sounds like something we could support.
If you have some code ready I'd be happy to check it out -- just open up a PR and I'll take a look.