feat: Add Slither to CI

- make foundry workflow kebab case

.github/workflows/slither.yml

@@ -0,0 +1,14 @@
+name: Slither Analysis
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  analyze:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: crytic/slither-action@v0.4.0