Add annotation flag support to the deploy and store-deploy

Adding support for annotations through annotation flag
to the faas-cli deploy and store-deploy.

Signed-off-by: Martin Dekov (VMware) <mdekov@vmware.com>

schema/store_item.go

@@ -12,5 +12,6 @@ type StoreItem struct {
 	RepoURL                string            `json:"repo_url"`
 	Environment            map[string]string `json:"environment"`
 	Labels                 map[string]string `json:"labels"`
+	Annotations            map[string]string `json:"annotations"`
 	ReadOnlyRootFilesystem bool              `json:"readOnlyRootFilesystem"`
 }