Fix client_registration URI regex not accepting full query string grammar

[t3chguy]

The grammar is pretty hellish and parsing a URL by using a regex is awful =(

https://www.cl.cam.ac.uk/~jac22/books/www/book/node166.html

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[mcalinghee]

In order to make it easier to understand on what the regex will parse, we can add a test in client_registration_test.rego

test_parse_uri if {
	client_uri_query := client_registration.parse_uri("https://example.com:8080/users?query=test")
	client_uri_query.authority == "example.com:8080"
	client_uri_query.host == "example.com"
	client_uri_query.path == "/users"
	client_uri_query.scheme == "https"
	client_uri_query.port == "8080"
	client_uri_query.query == "?query=test"
}

[sandhose]

Tested locally and looks like it works well, thanks!