Compare the signer of the normal message and the signer of MsgExcute

[Mdaiki0730]

Description

Currently, msgs signer validation is not performed when dispatching msgs of MsgExcute.
This leads to serious problems such as fraudulent transfers.

This can be prevented by making sure that the signer of the msg executed when dispatching msg is the signer of MsgExcute.
We will have to discuss later whether this modification is sufficient.

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

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (feat/zkauth@0b5b207). Click here to learn what that means.

Additional details and impacted files

@@              Coverage Diff               @@
##             feat/zkauth    #1291   +/-   ##
==============================================
  Coverage               ?   69.57%           
==============================================
  Files                  ?      659           
  Lines                  ?    68385           
  Branches               ?        0           
==============================================
  Hits                   ?    47577           
  Misses                 ?    18553           
  Partials               ?     2255           

Files	Coverage Δ
x/zkauth/keeper/keeper.go	67.44% <100.00%> (ø)
x/zkauth/keeper/msg_server.go	62.50% <100.00%> (ø)

[ulbqb]

How about adding a test case with the wrong zk signer?

[shiki-tak]

LGTM