Initial commit of source-ballchasing connector

Adds an initial implementation that pulls from the ballchasing API.

.github/workflows/ci.yaml

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+name: Build and push Docker image
+
+on: push
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      # 
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          # push only if building the main branch
+          push: ${{ github.ref == 'refs/heads/main' }}
+          tags: ghcr.io/estuary/source-ballchasing:dev
+

.gitignore

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+/target