ledger: move accountUpdatesLedgerEvaluator to tracker.go

[algorandskiy]

Summary

accountUpdatesLedgerEvaluator used to only implement a couple lookup methods from accountUpdates but now it uses txtail and online accounts trackers. Moved to tracker.go where it is used.

Test Plan

Existing tests should pass

[winder]

Could you wait to do this until we've deprecated the version of Indexer that depends on go-algorand? It uses these functions.

Nevermind. They're still in the same package so it shouldn't make a difference.

[codecov]

Codecov Report

Merging #5644 (be31006) into master (39ad943) will increase coverage by 0.28%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##           master    #5644      +/-   ##
==========================================
+ Coverage   54.63%   54.92%   +0.28%     
==========================================
  Files         463      463              
  Lines       64553    64553              
==========================================
+ Hits        35270    35457     +187     
+ Misses      26879    26709     -170     
+ Partials     2404     2387      -17     

Files Changed	Coverage Δ
ledger/acctupdates.go	71.82% <ø> (+0.46%)	⬆️
ledger/tracker.go	73.76% <60.00%> (-3.06%)	⬇️

... and 34 files with indirect coverage changes

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[AlgoAxel]

Difficult to tell with the way git renders it, but reading over this it appears to be pure drag-and-drop reorganization. Cleans up our imports slightly too :)