refactor: use maps.Copy for cleaner map handling

[gopherorg]

👮🏻👮🏻👮🏻 !!!! REFERENCE THE PROBLEM YOUR ARE SOLVING IN THE PR TITLE AND DESCRIBE YOUR SOLUTION HERE !!!! DO NOT FORGET !!!! 👮🏻👮🏻👮🏻

There is a new function added in the go1.21 standard library, which can make the code more concise and easy to read.

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! :)

[songgaoye]

@gopherorg Thank you for your contribution. could you rebase main branch and add change log? you also need to to sign your commits.

[gopherorg]

@gopherorg Thank you for your contribution. could you rebase main branch and add change log? you also need to to sign your commits.

Rebased and signed. And also add Changelog.

Please review again.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 34.20%. Comparing base (b1874b6) to head (43fd3d9).

Files with missing lines	Patch %	Lines
app/app.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1170      +/-   ##
==========================================
+ Coverage   31.79%   34.20%   +2.40%     
==========================================
  Files          92      100       +8     
  Lines       17139    17435     +296     
==========================================
+ Hits         5450     5964     +514     
+ Misses      10744    10517     -227     
- Partials      945      954       +9     

Flag	Coverage Δ
integration_tests	24.01% <0.00%> (+<0.01%)	⬆️
integration_tests_byzantine	11.13% <0.00%> (+<0.01%)	⬆️
integration_tests_gov	11.38% <0.00%> (+<0.01%)	⬆️
integration_tests_grpc	11.38% <0.00%> (+<0.01%)	⬆️
integration_tests_ibc	26.60% <0.00%> (+<0.01%)	⬆️
integration_tests_ledger	11.36% <0.00%> (+<0.01%)	⬆️
integration_tests_slow	11.36% <0.00%> (+<0.01%)	⬆️
integration_tests_solomachine	11.17% <0.00%> (+<0.01%)	⬆️
integration_tests_upgrade	11.38% <0.00%> (+<0.01%)	⬆️
unit_tests	11.83% <0.00%> (?)

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[songgaoye]

lgtm. pending other reviews

[gopherorg]

friendly ping