ci: add slither static analyzer (#225)

<!--
Please read and fill out this form before submitting your PR.

Please make sure you have reviewed our contributors guide before
submitting your
first PR.
-->

## Overview

<!-- 
Please provide an explanation of the PR, including the appropriate
context,
background, goal, and rationale. If there is an issue with this
information,
please provide a tl;dr and link the issue. 
-->

## Checklist

<!-- 
Please complete the checklist to ensure that the PR is ready to be
reviewed.

IMPORTANT:
PRs should be left in Draft until the below checklist is completed.
-->

- [ ] New and updated code has appropriate documentation
- [ ] New and updated code has new and/or updated testing
- [ ] Required CI checks are passing
- [ ] Visual proof for any user facing features like CLI or
documentation updates
- [ ] Linked issues closed with keywords

Author: rach-id

.github/workflows/code-analysis.yml

@@ -0,0 +1,41 @@
+name: Slither Analysis
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  analyze:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Install Foundry
+        uses: onbjerg/foundry-toolchain@v1
+        with:
+          version: nightly
+
+      - name: Build project
+        working-directory: ./
+        run: forge build --build-info --skip test script
+
+      - name: Run Slither
+        uses: crytic/slither-action@v0.3.0
+        id: slither
+        with:
+          ignore-compile: true
+          node-version: 16
+          sarif: results.sarif
+          fail-on: none
+
+      - name: Upload SARIF file
+        uses: github/codeql-action/upload-sarif@v2
+        with:
+          sarif_file: ${{ steps.slither.outputs.sarif }}

slither.config.json

@@ -0,0 +1,3 @@
+{
+  "filter_paths": "(lib/)"
+}