feat: Convert AppStateController to typescript (#27572)

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## **Description**

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As a prerequisite for migrating AppStateController to BaseController v2,
and to support the TypeScript migration effort for the extension, we
want to convert AppStateController to TypeScript along with its tests.

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## **Related issues**

Fixes: #25922 

## **Manual testing steps**
N/A

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### **Before**

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### **After**

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## **Pre-merge author checklist**

- [x] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask
Extension Coding
Standards](https://github.com/MetaMask/metamask-extension/blob/develop/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've completed the PR template to the best of my ability
- [x] I’ve included tests if applicable
- [x] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
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- [x] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-extension/blob/develop/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

.eslintrc.js

@@ -307,7 +307,7 @@ module.exports = {
     {
       files: [
         '**/__snapshots__/*.snap',
-        'app/scripts/controllers/app-state.test.js',
+        'app/scripts/controllers/app-state-controller.test.ts',
         'app/scripts/controllers/mmi-controller.test.ts',
         'app/scripts/controllers/alert-controller.test.ts',
         'app/scripts/metamask-controller.actions.test.js',