Discuss whether the msg validation content in MsgExcution is sufficient

[Mdaiki0730]

Summary

Discuss whether the msg validation content in MsgExcution is sufficient

Problem Definition

We need to consider whether we need to perform internal validation in addition to the msgs signer validation fixed in #1291.
We clarify the validation normally done in msg and make sure that MsgExecution's Dispatch has the same security.

Proposal

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