python3-varlink: add recipe

Reference Python Varlink binding. Fetched from git as 32.1.0 was never
published to PyPI (latest there is 31.0.0 from 2021).

AI-Generated: Claude Opus 5 (Claude Code)
Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>

meta-python/recipes-core/packagegroups/packagegroup-meta-python.bb

@@ -440,6 +440,7 @@ RDEPENDS:packagegroup-meta-python3 = "\
     python3-ujson \
     python3-unidiff \
     python3-uritemplate \
+    python3-varlink \
     python3-vcversioner \
     python3-versioneer \
     python3-versiontools \