[rfile] Move RFile interface out of Experimental - #23637

Process completed with exit code 123.

tutorials/io/rfile/rfile002_rntuple.py:11:1: I001 Import block is un-sorted or un-formatted help: Organize imports

tutorials/io/rfile/rfile001_basics.py:11:1: I001 Import block is un-sorted or un-formatted help: Organize imports

io/io/test/rfile.py:154:59: F841 Local variable `file` is assigned to but never used help: Remove assignment to unused variable `file`

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: astral-sh/ruff-action@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/