devtools: implement clearBreakpoint (#42154)

Add an event listener for `clearBreakpoint` to `debugger.js` and the
necessary glue to access it from the `devtools` crate.

Testing: `./mach test-devtools` and manual testing.
Fixes: Part of: https://github.com/servo/servo/issues/36027

---------

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

components/script_bindings/webidls/DebuggerClearBreakpointEvent.webidl

@@ -0,0 +1,12 @@
+/* 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/. */
+
+// This interface is entirely internal to Servo, and should not be accessible to
+// web pages.
+[Exposed=DebuggerGlobalScope]
+interface DebuggerClearBreakpointEvent : Event {
+    readonly attribute unsigned long spidermonkeyId;
+    readonly attribute unsigned long scriptId;
+    readonly attribute unsigned long offset;
+};