docs-util: added a namespaces plugin (#8500)

Added a namespaces plugin that allows generating namespaces and automatically adds reflections in a path pattern to the namespace.

This is particularly useful for the workflows reference, as workflows under the `**/packages/core/core-flows/**/workflows/**` path pattern are shown under a Workflows title, and steps under the path pattern `**/packages/core/core-flows/**/steps/**` are shown under a Steps title.

www/utils/yarn.lock

@@ -3906,6 +3906,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"minimatch@npm:^10.0.1":
+  version: 10.0.1
+  resolution: "minimatch@npm:10.0.1"
+  dependencies:
+    brace-expansion: ^2.0.1
+  checksum: e6c29a81fe83e1877ad51348306be2e8aeca18c88fdee7a99df44322314279e15799e41d7cb274e4e8bb0b451a3bc622d6182e157dfa1717d6cda75e9cd8cd5d
+  languageName: node
+  linkType: hard
+
 "minimatch@npm:^3.0.2, minimatch@npm:^3.0.3, minimatch@npm:^3.0.5, minimatch@npm:^3.1.1, minimatch@npm:^3.1.2":
   version: 3.1.2
   resolution: "minimatch@npm:3.1.2"
@@ -5374,6 +5383,7 @@ __metadata:
     "@types/node": ^16.11.10
     eslint: ^8.53.0
     glob: ^10.3.10
+    minimatch: ^10.0.1
     types: "*"
     typescript: 5.5
     utils: "*"