Problem: memiavl configs are not defined in app.toml

[yihuang]

Solution:

• integrate custom configs into app.toml

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PR Checklist:

• Have you read the CONTRIBUTING.md?
• Does your PR follow the C4 patch requirements?
• Have you rebased your work on top of the latest master?
• Have you checked your code compiles? (make)
• Have you included tests for any non-trivial functionality?
• Have you checked your code passes the unit tests? (make test)
• Have you checked your code formatting is correct? (go fmt)
• Have you checked your basic code style is fine? (golangci-lint run)
• If you added any dependencies, have you checked they do not contain any known vulnerabilities? (go list -json -m all | nancy sleuth)
• If your changes affect the client infrastructure, have you run the integration test?
• If your changes affect public APIs, does your PR follow the C4 evolution of public contracts?
• If your code changes public APIs, have you incremented the crate version numbers and documented your changes in the CHANGELOG.md?
• If you are contributing for the first time, please read the agreement in CONTRIBUTING.md now and add a comment to this pull request stating that your PR is in accordance with the Developer's Certificate of Origin.

Thank you for your code, it's appreciated! :)

[codecov]

Codecov Report

Merging #1028 (d5aa5c2) into main (cf9648d) will increase coverage by 0.02%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main    #1028      +/-   ##
==========================================
+ Coverage   45.71%   45.73%   +0.02%     
==========================================
  Files          80       82       +2     
  Lines        6895     6907      +12     
==========================================
+ Hits         3152     3159       +7     
- Misses       3411     3416       +5     
  Partials      332      332              

Impacted Files	Coverage Δ
app/memiavl.go	20.00% <20.00%> (ø)
app/config/config.go	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes