kopf doesn't construct JSONPatches correctly when keys include characters like ~ and /

[sambhav]

This causes issues when trying to patch labels that contain / for eg app.kubernetes.io/created-by

See the offending lines at

kopf/kopf/_cogs/structs/patches.py

Lines 94 to 101 in ab53ace

	result.append(JSONPatchItem(op='remove', path='/'.join(keys)))
	elif len(keys) > 1 and self._original and not self._is_in_original_path(keys):
	result.append(JSONPatchItem(op='add', path='/'.join(keys), value=value))
	elif isinstance(value, collections.abc.Mapping) and value:
	for key, val in value.items():
	result.extend(self._as_json_patch(val, keys + [key]))
	else:
	result.append(JSONPatchItem(op='replace', path='/'.join(keys), value=value))

We need to ensure that ~ is encoded to ~0 and / to ~1

See https://datatracker.ietf.org/doc/html/rfc6901#section-3 and json-patch/json-patch-tests#42