Enable Datadog static analysis (DataDog#5057)

* Add Datadog static analysis

* Add ruleset

* Move file to required location

Author: andrewlock

.github/workflows/datadog-static-analysis.yml

@@ -0,0 +1,21 @@
+# Based on https://app.datadoghq.com/ci/setup/static-analysis?provider=github
+on: [push]
+
+jobs:
+  check-quality:
+    runs-on: ubuntu-latest
+    name: Datadog Static Analyzer
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Check code meets quality standards
+        id: datadog-static-analysis
+        uses: DataDog/datadog-static-analyzer-github-action@v1
+        with:
+          dd_api_key: ${{ secrets.DD_API_KEY }}
+          dd_app_key: ${{ secrets.DD_APP_KEY }}
+          dd_service: dd-trace-dotnet
+          dd_site: datadoghq.com
+          dd_env: ci
+          cpu_count: 2
+          

static-analysis.datadog.yml

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+rulesets:
+  - csharp-best-practices           # ensure best practices are followed
+  - csharp-code-style               # code-style enforcement for C#
+  - csharp-inclusive                # ensure that we use inclusive wording in our codebase
+  - csharp-security                 # ensure your C# code is safe and secure