API: Incorporate deltas in presenting paginated view of assets or applications

[gmalouf]

Summary

Incorporate deltas in presenting paginated view of assets or applications on a per account basis. Includes necessary logic to apply delta changes on top of data queried against database, calculating that the next token returned does not result in missing any entries.

Test Plan

Several test cases were added to cover create/modify/delete combinations between the deltas and persisted view for both assets and applications.

[codecov]

Codecov Report

❌ Patch coverage is 64.31925% with 76 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.83%. Comparing base (00da5ef) to head (39ba854).
⚠️ Report is 13 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...ver/v2/generated/nonparticipating/public/routes.go	0.00%	37 Missing ⚠️
ledger/acctupdates.go	80.11%	23 Missing and 11 partials ⚠️
ledger/ledger.go	0.00%	5 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (00da5ef) and HEAD (39ba854). Click for more details.

HEAD has 4 uploads less than BASE

Flag	BASE (00da5ef)	HEAD (39ba854)
full_coverage	4	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #6559       +/-   ##
===========================================
- Coverage   61.28%   47.83%   -13.45%     
===========================================
  Files         484      646      +162     
  Lines       67803    88209    +20406     
===========================================
+ Hits        41552    42197      +645     
- Misses      22401    43239    +20838     
+ Partials     3850     2773     -1077     

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