DevTools: Add resource_available as a common shared util (#36632)

These PR adds `resource_available` as a common shared util


- [x] ./mach build -d does not report any errors
- [x] ./mach test-tidy does not report any errors
- [x] These changes partially implement
https://github.com/servo/servo/issues/36027

---------

Signed-off-by: atbrakhi <atbrakhi@igalia.com>

components/devtools/resource.rs

@@ -0,0 +1,42 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use std::cell::RefCell;
+use std::collections::HashMap;
+use std::net::TcpStream;
+
+use serde::Serialize;
+
+use crate::StreamId;
+use crate::protocol::JsonPacketStream;
+
+#[derive(Serialize)]
+pub(crate) struct ResourceAvailableReply<T: Serialize> {
+    pub from: String,
+    #[serde(rename = "type")]
+    pub type_: String,
+    pub array: Vec<(String, Vec<T>)>,
+}
+
+pub(crate) trait ResourceAvailable {
+    fn actor_name(&self) -> String;
+
+    fn get_streams(&self) -> &RefCell<HashMap<StreamId, TcpStream>>;
+
+    fn resource_available<T: Serialize>(&self, resource: T, resource_type: String) {
+        self.resources_available(vec![resource], resource_type);
+    }
+
+    fn resources_available<T: Serialize>(&self, resources: Vec<T>, resource_type: String) {
+        let msg = ResourceAvailableReply::<T> {
+            from: self.actor_name(),
+            type_: "resources-available-array".into(),
+            array: vec![(resource_type, resources)],
+        };
+
+        for stream in self.get_streams().borrow_mut().values_mut() {
+            let _ = stream.write_json_packet(&msg);
+        }
+    }
+}