feat: implement fetch jwk

[shiki-tak]

Description

closes: #XXXX

Motivation and context

How has this been tested?

Screenshots (if appropriate):

Checklist:

• I followed the contributing guidelines and code of conduct.
• I have added a relevant changelog to CHANGELOG.md
• I have added tests to cover my changes.
• I have updated the documentation accordingly.
• I have updated API documentation client/docs/swagger-ui/swagger.yaml

[codecov]

Codecov Report

Attention: 58 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (feat/zkauth@1132e10). Click here to learn what that means.

Additional details and impacted files

@@              Coverage Diff               @@
##             feat/zkauth    #1240   +/-   ##
==============================================
  Coverage               ?   69.74%           
==============================================
  Files                  ?      654           
  Lines                  ?    67761           
  Branches               ?        0           
==============================================
  Hits                   ?    47260           
  Misses                 ?    18294           
  Partials               ?     2207           

Files	Coverage Δ
x/zkauth/testutil/keeper.go	100.00% <ø> (ø)
x/zkauth/types/codec.go	70.58% <80.00%> (ø)
x/zkauth/types/config.go	0.00% <0.00%> (ø)
x/zkauth/types/msgs.go	0.00% <0.00%> (ø)
x/zkauth/keeper/keeper.go	59.15% <54.68%> (ø)

[sonarcloud]

Quality Gate failed

Failed conditions
18.5% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud

[Mdaiki0730]

LGTM