testing: defi txn group benchmark

[algorandskiy]

Summary

Add a relatively large txn group benchmark with seen in the wild data

Test Plan

TODO: plug into txHandler testing infrastructure

[codecov]

Codecov Report

Merging #4886 (a64255c) into master (c0e044b) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4886      +/-   ##
==========================================
+ Coverage   54.06%   54.09%   +0.03%     
==========================================
  Files         427      427              
  Lines       53474    53474              
==========================================
+ Hits        28909    28928      +19     
+ Misses      22299    22286      -13     
+ Partials     2266     2260       -6     

Impacted Files	Coverage Δ
network/wsPeer.go	69.45% <0.00%> (-2.39%)	⬇️
network/wsNetwork.go	64.74% <0.00%> (-0.18%)	⬇️
ledger/testing/randomAccounts.go	56.61% <0.00%> (ø)
data/transactions/logic/assembler.go	86.50% <0.00%> (+0.13%)	⬆️
ledger/acctupdates.go	69.24% <0.00%> (+0.24%)	⬆️
ledger/acctonline.go	78.81% <0.00%> (+0.51%)	⬆️
ledger/tracker.go	75.94% <0.00%> (+0.84%)	⬆️
catchup/service.go	71.25% <0.00%> (+1.44%)	⬆️
crypto/merkletrie/node.go	93.48% <0.00%> (+1.86%)	⬆️
agreement/proposalManager.go	98.03% <0.00%> (+1.96%)	⬆️
... and 3 more

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[algonautshant]

Looks great.
Will be nice to add a description comments for each stage of the benchmark.
It is not straightforward what each one it evaluationg.
e.g.

1. Checks the lsig signature crypto only
2. Checks the sig crypto of 0 and 2, and the logic of 1 and 3
3. Checks the sig and lsig signature crypto only