Problem: block-stm tx executor bad worst case performance

[yihuang]

Solution:

• Optionally do pre-estimations on the keys touched by the tx.

Closes: #XXX

Description

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For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

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For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Attention: Patch coverage is 7.81250% with 59 lines in your changes missing coverage. Please review.

Project coverage is 60.24%. Comparing base (3fabdbe) to head (98721c2).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
app/executor.go	2.08%	47 Missing ⚠️
app/app.go	36.36%	7 Missing ⚠️
server/config/config.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #522      +/-   ##
===========================================
- Coverage    60.50%   60.24%   -0.26%     
===========================================
  Files          128      128              
  Lines         9757     9800      +43     
===========================================
+ Hits          5903     5904       +1     
- Misses        3273     3315      +42     
  Partials       581      581              

Files with missing lines	Coverage Δ
server/config/config.go	35.22% <0.00%> (-0.23%)	⬇️
app/app.go	76.24% <36.36%> (-0.14%)	⬇️
app/executor.go	3.73% <2.08%> (-0.81%)	⬇️