Add dependencies with native components as binary packages

The build time is very long because of PIP having to fetch and build
native components of the libraries. This change show a possible way to
bypass this issue. This has implication regarding the platform it's
running on. In this case, we know the charm is going to be run on a
22.04 container.

Change-Id: I96e7effad26922e36c00178c8a087b0a2511b7bf

charms/ovn-relay-k8s/charmcraft.yaml

@@ -25,3 +25,8 @@ parts:
       - pkg-config
       - rustc
       - cargo
+    charm-binary-python-packages:
+      - cryptography
+      - jsonschema
+      - jinja2
+      - git+https://opendev.org/openstack/charm-ops-sunbeam#egg=ops_sunbeam