types: support eth hex address on accounts

[fedekunze]

Description

ethermintcli q auth account $(ethermintcli keys show mykey -a) -o text
|
  address: eth1f8rqrfwut7ngkxwth0gt99h0lxnxsp09ngvzwl
  eth_address: 0x49c601A5DC5FA68b19CBbbd0b296eFF9a66805e5
  coins:
  - denom: aphoton
    amount: "1000000000000000000"
  - denom: stake
    amount: "999999999900000000"
  public_key: ethpub1pfqnmkepqw45vpsn6dzvm7k22zrghx0nfewjdfacy7wyycv5evfk57kyhwr8cqj5r4x
  account_number: 0
  sequence: 1
  code_hash: c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470

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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 #502 into development will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           development     #502      +/-   ##
===============================================
+ Coverage        71.72%   71.81%   +0.09%     
===============================================
  Files               40       40              
  Lines             2677     2679       +2     
===============================================
+ Hits              1920     1924       +4     
+ Misses             616      614       -2     
  Partials           141      141              

Impacted Files	Coverage Δ
types/account.go	62.16% <100.00%> (+3.82%)	⬆️

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