cli: add commands to inspect clients

wire/jay_client_query.txt

@@ -0,0 +1,49 @@
+request destroy { }
+
+request execute { }
+
+request add_all { }
+
+request add_id {
+    id: pod(u64),
+}
+
+event done { }
+
+event start {
+    id: pod(u64),
+}
+
+event end { }
+
+event sandboxed { }
+
+event sandbox_engine {
+    engine: str,
+}
+
+event sandbox_app_id {
+    app_id: str,
+}
+
+event sandbox_instance_id {
+    instance_id: str,
+}
+
+event uid {
+    uid: pod(uapi::c::uid_t),
+}
+
+event pid {
+    pid: pod(uapi::c::pid_t),
+}
+
+event is_xwayland { }
+
+event comm {
+    comm: str,
+}
+
+event exe {
+    exe: str,
+}

wire/jay_compositor.txt

@@ -109,6 +109,14 @@ request reexec (since = 17) {
     id: id(jay_reexec),
 }
 
+request create_client_query (since = 18) {
+    id: id(jay_client_query),
+}
+
+request kill_client (since = 18) {
+    id: pod(u64),
+}
+
 # events
 
 event client_id {

wire/jay_toplevel.txt

@@ -8,5 +8,9 @@ event id (since = 12) {
     id: str,
 }
 
+event client_id (since = 18) {
+    id: pod(u64),
+}
+
 event done (since = 12) {
 }