Add Snapper security scanning tool (#1830)

* Add Snapper security scanning tool

* Add notes to Snaps Get Allowlisted

---------

Co-authored-by: Christian Montoya <[email protected]>

Author: alexandratran

snaps/how-to/get-allowlisted.md

@@ -32,6 +32,11 @@ Always do your own research before installing a Snap.
   - Is [published](publish-a-snap.md) to npm.
   - Does not impair MetaMask's compliance with laws or regulations.
 
+- Remove any `console` logs, "to-do" comments, and unused permissions or methods.
+
+- Scan your Snap for security vulnerabilities using [Snapper](https://github.com/sayfer-io/Snapper) and 
+  resolve any reported issues.
+
 - If your Snap uses any of the following API methods related to key management, you must provide
   evidence of a third-party audit from an approved auditor:
 

snaps/learn/resources.md

@@ -55,6 +55,8 @@ View the following Snaps resources in addition to this documentation site.
 - [Snaps Simulator](https://metamask.github.io/snaps/snaps-simulator/latest) - A tool for simulating
   Snaps in the browser, streamlining the development process. It doesn't support all Snaps features 
   but can be useful for testing certain features.
+- [Snapper](https://github.com/sayfer-io/Snapper) - A tool for detecting security vulnerabilities,
+  identifying potential issues, and ensuring best coding practices in your Snap.
 - [MetaMask Testing Tools](https://hugomrdias.github.io/metamask/) - A collection of tools for 
   testing MetaMask, MetaMask Flask, and MetaMask Snaps with [Playwright](https://playwright.dev/), 
   delivered as an npm package that provides a `createFixture` function that returns a `test` and