Set defaults for token claims

This MR sets appropriate defaults for claims that valid scitokens should have in order to be used for gwdatafind queries.

gwdatafind/ui.py

@@ -115,6 +115,11 @@ def get(url, *args, **kwargs):
     if url.startswith("http://") and requests.__version__ < "2.15.0":
         # workaround https://github.com/psf/requests/issues/4025
         kwargs.setdefault("cert", False)
+    kwargs.setdefault("token_audience", [
+        "{0.scheme}://{0.netloc}".format(urlparse(url)),
+        "ANY",
+    ])
+    kwargs.setdefault("token_scope", "read:/frames")
     return _get(url, *args, **kwargs)