bench(corpus-gen): add support for VM based endpoints

[brbrr]

fixes: #4056

[codecov]

Codecov Report

❌ Patch coverage is 91.70306% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.35%. Comparing base (9c72000) to head (927010f).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
bench/rpc/cmd/corpus-gen/call.go	87.03%	7 Missing ⚠️
bench/rpc/cmd/corpus-gen/broadcasted_txs.go	94.28%	4 Missing ⚠️
bench/rpc/cmd/corpus-gen/verify.go	66.66%	4 Missing ⚠️
bench/rpc/cmd/corpus-gen/simulate_transactions.go	84.61%	2 Missing ⚠️
bench/rpc/cmd/corpus-gen/block_range_flags.go	95.23%	1 Missing ⚠️
bench/rpc/cmd/corpus-gen/estimate_fee.go	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4061      +/-   ##
==========================================
+ Coverage   79.33%   80.35%   +1.02%     
==========================================
  Files         466      471       +5     
  Lines       35794    36227     +433     
==========================================
+ Hits        28397    29111     +714     
+ Misses       7388     7107     -281     
  Partials        9        9              

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