sambacc: add is_rados_uri helper function

Add `is_rados_uri` that will return true if a uri string containes a
rados-specific scheme.

Signed-off-by: John Mulligan <[email protected]>

Author: phlogistonjohn

sambacc/rados_opener.py

@@ -380,6 +380,14 @@ def create_from_uri(cls, uri: str) -> Self:
         return cls(handler, uri)
 
 
+def is_rados_uri(uri: str) -> bool:
+    """Return true if the string can be used as a rados (pseudo) URI.
+    This function does not require the rados libraries to be available.
+    NB: It does not validate the structure of the URI.
+    """
+    return uri.startswith("rados:")
+
+
 def enable_rados_url_opener(
     cls: typing.Type[url_opener.URLOpener],
     *,