[13.x] Fix clients confidentiality

[hafezdivandari]

All grant types (except client credentials grant) allow public client (client with no secret). This PR:

• Prompt user for creating confidential or public client on passport:client command, for grant types that support public option: "Authorization code", "Password", and "Device Authorization" (TBD [13.x] Device Authorization Grant RFC8628 #1750) grants.
• Fix implicit client creation was always confidential unnecessarily.
• Clean up passport:client command.

Summary

Grant	Public	Confidential	Changes
Authorization code	✓	✓	Prompt user on passport:client command.
Client credentials	✗	✓	No change
Device authorization	✓	✓	TBD #1750
Implicit	✓	✗	Fixed
Password	✓	✓	Prompt user on passport:client command
Personal access	N/A	N/A	No change
Refresh token	✓	✓	No change