Simulate: Enable on follower node & allow specifying starting round

[jasonpaulos]

Summary

Fixes #5651

Additionally, adds simulate option to choose the round the simulation should be based on (instead of always using latest).

Test Plan

• Unit test added to check that the Simulate methods works on AlgorandFollowerNode
• Unit & e2e tests added to ensure simulate can use a different starting round

[codecov]

Codecov Report

Merging #5685 (126a544) into master (10f2f55) will increase coverage by 0.39%.
The diff coverage is 53.84%.

@@            Coverage Diff             @@
##           master    #5685      +/-   ##
==========================================
+ Coverage   55.06%   55.45%   +0.39%     
==========================================
  Files         473      473              
  Lines       66281    66316      +35     
==========================================
+ Hits        36495    36777     +282     
+ Misses      27285    27038     -247     
  Partials     2501     2501              

Files Changed	Coverage Δ
daemon/algod/api/server/v2/handlers.go	0.80% <ø> (ø)
daemon/algod/api/server/v2/utils.go	7.59% <0.00%> (-0.03%)	⬇️
ledger/acctupdates.go	70.91% <0.00%> (-0.63%)	⬇️
ledger/ledger.go	68.88% <0.00%> (-0.69%)	⬇️
cmd/goal/clerk.go	9.42% <33.33%> (+0.08%)	⬆️
ledger/simulation/simulator.go	82.90% <89.47%> (+3.10%)	⬆️
node/follower_node.go	45.16% <100.00%> (ø)

... and 36 files with indirect coverage changes

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[ahangsu]

seems right to me, just asking questions for understandings.