Added detype_patterns() with @cache.

Avoids excessive calls to `detype_pattern()` with the same arguments.

Co-authored-by: T. Franzel <tfranzel@users.noreply.github.com>

drf_spectacular/plumbing.py

@@ -891,7 +891,7 @@ def modify_for_versioning(patterns, method, path, view, requested_version):
     elif issubclass(view.versioning_class, versioning.NamespaceVersioning):
         try:
             view.request.resolver_match = get_resolver(
-                urlconf=tuple(detype_pattern(p) for p in patterns)
+                urlconf=detype_patterns(tuple(patterns)),
             ).resolve(path)
         except Resolver404:
             error(f"namespace versioning path resolution failed for {path}. Path will be ignored.")
@@ -976,6 +976,12 @@ def analyze_named_regex_pattern(path):
     return result
 
 
+@cache
+def detype_patterns(patterns):
+    """Cache detyped patterns due to the expensive nature of rebuilding URLResolver."""
+    return tuple(detype_pattern(pattern) for pattern in patterns)
+
+
 def detype_pattern(pattern):
     """
     return an equivalent pattern that accepts arbitrary values for path parameters.