feat: add dump iavl root cmd

[songgaoye]

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

PR Checklist:

• Have you read the CONTRIBUTING.md?
• Does your PR follow the C4 patch requirements?
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• If you added any dependencies, have you checked they do not contain any known vulnerabilities? (go list -json -m all | nancy sleuth)
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• 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

❌ Patch coverage is 50.41322% with 60 lines in your changes missing coverage. Please review.
✅ Project coverage is 29.09%. Comparing base (b1436a5) to head (f7fe206).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/chain-maind/app/dump_root.go	48.71%	59 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1191      +/-   ##
==========================================
- Coverage   31.02%   29.09%   -1.94%     
==========================================
  Files         106      115       +9     
  Lines       18910    19329     +419     
==========================================
- Hits         5867     5623     -244     
- Misses      12000    12834     +834     
+ Partials     1043      872     -171     

Flag	Coverage Δ
integration_tests	?
integration_tests_byzantine	11.37% <50.41%> (+0.24%)	⬆️
integration_tests_gov	11.59% <50.41%> (+0.24%)	⬆️
integration_tests_grpc	11.59% <50.41%> (+0.24%)	⬆️
integration_tests_ibc	25.10% <50.41%> (+0.16%)	⬆️
integration_tests_ledger	11.58% <50.41%> (+0.24%)	⬆️
integration_tests_slow	11.58% <50.41%> (+0.24%)	⬆️
integration_tests_solomachine	11.40% <50.41%> (+0.24%)	⬆️
integration_tests_upgrade	11.59% <50.41%> (+0.24%)	⬆️
unit_tests	12.42% <0.00%> (?)

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[songgaoye]

dump memiavl in this crypto-org-chain/cronos-store#6