Add auth and functionality to Certificate Auth Page

[Gokul2003g]

Description:

The UI is now complete, and the following tasks need to be implemented:

• Add Authentication:

  • Implement authentication similar to the web UI, allowing users to log in via Google and obtain the access token.

• Add Upload Button for Public Key:

  • Add a button to upload or select the public key file.

• Send Request to CA-Server:

  • After selecting the public key, send a request to the CA-Server with this payload structure:

accessToken to be sent in Authentication Header

```json
{
  "email": "user-email",
  "provider": "google",
  "publicKey": "public-key",
  "ishost": "true|false",
}
```

• Download Certificate:

  • Obtain the certificate from the CA-Server response and provide an option to download it.

• Retrieve and Display User Gravatar:

  • Use the access token to get the user's Gravatar and display it in the UI.

• Add Signout Button:

  • Add a signout button, similar to the web UI, to allow users to log out.