Add gatherUsageStats flag

packages/kernel/src/worker.ts

@@ -279,6 +279,8 @@ async function loadPyodideAndPackages() {
   console.debug("Booting up the Streamlit server");
   // The following Python code is based on streamlit.web.cli.main_run().
   self.__streamlitFlagOptions__ = {
+    // gatherUsageStats is disabled as default, but can be enabled explicitly by setting it to true.
+    "browser.gatherUsageStats": false, 
     ...streamlitConfig,
     "runner.fastReruns": false, // Fast reruns do not work well with the async script runner of stlite. See https://github.com/whitphx/stlite/pull/550#issuecomment-1505485865.
   };