[FEAT] key manager menu and resolve issue 231

[15100399015]

What is the purpose of the change

Related issues/PRs

Related issues: #231 Related issues: #224

Brief change log

Checklist

• [x] I have read the Contributing Guidelines on pull requests.
• [x] I have explained the need for this PR and the problem it solves
• [x] I have explained the changes or the new features added to this PR
• [x] I have added tests corresponding to this change
• [x] I have updated the documentation to reflect this change
• [x] I have verified that this change is backward compatible
• [x] If this is a code change: I have written unit tests to fully verify the new behavior.

[nutsjian]

LGTM