Snowflake backend for devlow

This adds a backend to devlow for Vercel’s HTTP data api for sending values to Snowflake. It requires the gateway’s batch uri endpoint, schema id, and topic name.

It collects the metrics and sends them as a batch, each with relevant metadata similar to the metadata collected by the Datadog backend.

Test Plan:

- [ ] Manual test

.github/workflows/build_and_test.yml

@@ -194,6 +194,18 @@ jobs:
       stepName: 'devlow-bench-${{ matrix.mode }}-${{ matrix.selector }}'
     secrets: inherit
 
+  test-devlow:
+    name: test devlow package
+    needs: ['optimize-ci', 'changes']
+    if: ${{ needs.optimize-ci.outputs.skip == 'false' && needs.changes.outputs.docs-only == 'false' }}
+    strategy:
+      fail-fast: false
+    uses: ./.github/workflows/build_reusable.yml
+    with:
+      stepName: 'test-devlow'
+      afterBuild: pnpm install && pnpm run --filter=devlow-bench test
+    secrets: inherit
+
   test-turbopack-dev:
     name: test turbopack dev
     needs: ['optimize-ci', 'changes', 'build-next', 'build-native']