feat: add files localfs provider

New files API and the localfs provider. Mostly used for RAG.

Relates to: RHAIENG-896
Signed-off-by: Sébastien Han <seb@redhat.com>

Author: leseb

distribution/build.yaml

@@ -29,6 +29,8 @@ distribution_spec:
     - provider_type: remote::tavily-search
     - provider_type: inline::rag-runtime
     - provider_type: remote::model-context-protocol
+    files:
+    - provider_type: inline::localfs
   container_image: registry.redhat.io/ubi9/python-311:9.6-1749631027
 additional_pip_packages:
 - aiosqlite