[Flow EVM] improve debug tracing

[ramtinms]

This PR improves tracing

• by wrapping trace methods for panics if not nil (the geth code have nil checks)
• will not re-create the wrapper in case of two calls to TxTracer
• adds debug level logs for tracing
• adds a test for the case that a contract is called through a proxy

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 32.03125% with 87 lines in your changes missing coverage. Please review.

Project coverage is 42.79%. Comparing base (29ec7b8) to head (762d8bb).

Files	Patch %	Lines
fvm/evm/debug/tracer.go	33.06%	75 Missing and 8 partials ⚠️
fvm/evm/testutils/contract.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6299      +/-   ##
==========================================
+ Coverage   39.46%   42.79%   +3.32%     
==========================================
  Files        1773     1758      -15     
  Lines      123185   119169    -4016     
==========================================
+ Hits        48616    50995    +2379     
+ Misses      69296    63062    -6234     
+ Partials     5273     5112     -161     

Flag	Coverage Δ
unittests	42.79% <32.03%> (+3.32%)	⬆️

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