Incorrect error messages shown for client validations in PAR request

[aka4rKO]

Description:
Currently when client ID is not available in the PAR request object the following error is returned.

{
    "error_description": "application.not.found",
    "error": "invalid_request"
}

Need to change the error messages to a more meaningful errors for the following scenarios:

1. When the client_id is missing
2. When an invalid client_id is sent
3. When an invalid redirect_uri is sent