Feat/add public clients support

[Nirav-Gaglani]

Fixes Issue

Closes #46

Changes proposed

• Added none option to Token endpoint auth method
• Conditional rendering of client secret input based on the selected token endpoint auth method

Check List (Check all the applicable boxes)

• My code follows the code style of this project.
• My change requires changes to the documentation.
• I have updated the documentation accordingly.
• All new and existing tests passed.
• This PR does not contain plagiarized content.
• The title of my pull request is a short description of the requested changes.

Screenshots

Client secret required when token endpoint method is other than none

Client secret not required when token endpoint method is none

Note to reviewers

• Inorder to create public client, none option has been added to token endpoint auth method dropdown.
• Client secret has been removed when none is selected, else it is required