Add Account Deletion and Password Change to CLI Commands

[chacha912]

What would you like to be added:

Currently, our CLI supports login and logout commands:
https://yorkie.dev/docs/cli#login

$ yorkie login -u <username> -p <password> --rpc-addr api.yorkie.dev:443
$ yorkie logout

With the recent development of ChangePassword and DeleteAccount APIs on the server side(#849), we should extend our CLI functionality to include these features.

Implementation Details

• Integrate with the newly developed server APIs: ChangePassword and DeleteAccount.
• Implement proper error handling and user feedback.
• Ensure secure handling of sensitive information (passwords).
• Update CLI documentation to reflect these new commands.

Security Considerations

• For the delete account command, consider implementing a confirmation step to prevent accidental deletions.
• Ensure all communications with the server for these sensitive operations are properly encrypted.

Why is this needed:

CLI users can manage their accounts without switching to a different interface, streamlining their workflow.

[krapie]

Currently, account deletion does not performing cascading deletion over associated resources.
We might need to manually handle orphan resources after the account is removed.
#946