Bug 1811076: Part 5 - Add UI notifications for content analysis results r=nika,Gijs,fluent-reviewers,flod

Connects content analysis checks with the tab that their messages
to the user should appear on.  Adds notifications for the
CA messages.

Differential Revision: https://phabricator.services.mozilla.com/D191784

Author: gregstoll

browser/base/content/browser.js

@@ -24,6 +24,7 @@ ChromeUtils.defineESModuleGetters(this, {
   BrowserUsageTelemetry: "resource:///modules/BrowserUsageTelemetry.sys.mjs",
   BrowserWindowTracker: "resource:///modules/BrowserWindowTracker.sys.mjs",
   Color: "resource://gre/modules/Color.sys.mjs",
+  ContentAnalysis: "resource:///modules/ContentAnalysis.sys.mjs",
   ContextualIdentityService:
     "resource://gre/modules/ContextualIdentityService.sys.mjs",
   CustomizableUI: "resource:///modules/CustomizableUI.sys.mjs",
@@ -1871,6 +1872,7 @@ var gBrowserInit = {
     BrowserOffline.init();
     CanvasPermissionPromptHelper.init();
     WebAuthnPromptHelper.init();
+    ContentAnalysis.initialize();
 
     // Initialize the full zoom setting.
     // We do this before the session restore service gets initialized so we can