rpc: investigate refund option

[chfast]

This tries to investigate NoRefund JSON option for debug_trace* RPC methods. This option seems to disable gas refunds application after any transaction execution. This option is not present in the geth's RPC.

This PR if the option is ever used in Silkworm tests. It seems not.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 50.62%. Comparing base (b00be69) to head (5bda5aa).

Files with missing lines	Patch %	Lines
silkworm/core/execution/processor.cpp	50.00%	0 Missing and 2 partials :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2644      +/-   ##
==========================================
- Coverage   50.64%   50.62%   -0.02%     
==========================================
  Files         784      784              
  Lines       52452    52456       +4     
  Branches     8107     8109       +2     
==========================================
- Hits        26562    26555       -7     
- Misses      23581    23582       +1     
- Partials     2309     2319      +10     

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