types: unmarshal account from hex address

[fedekunze]

addition to #502

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

Merging #504 into development will increase coverage by 0.21%.
The diff coverage is 96.00%.

@@               Coverage Diff               @@
##           development     #504      +/-   ##
===============================================
+ Coverage        71.73%   71.94%   +0.21%     
===============================================
  Files               41       41              
  Lines             2685     2709      +24     
===============================================
+ Hits              1926     1949      +23     
- Misses             618      619       +1     
  Partials           141      141              

Impacted Files	Coverage Δ
types/account.go	70.40% <96.00%> (+8.24%)	⬆️

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[DeepalUsyD]

Thank you this solved the issue