Problem: custom cache store impl not unified with sdk

[yihuang]

Solution:

• Reuse the refactored cache store with sdk

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 75.67568% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 63.36%. Comparing base (e3e4649) to head (1881ab2).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #446      +/-   ##
===========================================
+ Coverage    62.56%   63.36%   +0.80%     
===========================================
  Files          130      125       -5     
  Lines        12513    12061     -452     
===========================================
- Hits          7829     7643     -186     
+ Misses        4138     3875     -263     
+ Partials       546      543       -3     

Files	Coverage Δ
app/app.go	82.21% <100.00%> (-0.19%)	⬇️
x/evm/keeper/keeper.go	89.15% <ø> (-0.20%)	⬇️
x/evm/statedb/native.go	100.00% <100.00%> (ø)
x/evm/statedb/statedb.go	80.95% <71.87%> (-0.84%)	⬇️