CODEOWNERS: assign kvstoremesh to @cilium/sig-clustermesh

kvstoremesh is a companion component of the already existing
clustermesh-apiserver, hence it feels natural to assign it to the
sig-clustermesh team.

Signed-off-by: Marco Iorio <marco.iorio@isovalent.com>

CODEOWNERS

@@ -362,6 +362,7 @@ Makefile* @cilium/build
 /install/kubernetes/ @cilium/sig-k8s @cilium/helm
 /install/kubernetes/cilium/templates/hubble* @cilium/sig-k8s @cilium/helm @cilium/sig-hubble
 jenkinsfiles @cilium/ci-structure
+/kvstoremesh @cilium/sig-clustermesh
 /LICENSE @cilium/tophat
 /MAINTAINERS.md @cilium/contributing
 /netlify.toml @cilium/ci-structure