feat: initial Rust crate for building sqlc plugins

- Add project structure with Cargo.toml and dependencies
- Setup CI workflow with format, lint, build, and test steps
- Configure Dependabot for daily dependency updates
- Add protobuf schema for sqlc plugin communication
- Implement build script for proto code generation
- Create core library with plugin types and prelude module

Signed-off-by: Svetlin Ralchev <iamralch@users.noreply.github.com>

Author: iamralch

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "cargo"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflows/ci.yml

@@ -0,0 +1,24 @@
+name: CI
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+env:
+  CARGO_TERM_COLOR: always
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup Protoc
+        uses: arduino/setup-protoc@v3
+      - name: Format
+        run: cargo fmt --check
+      - name: Lint
+        run: cargo clippy -- -D warnings
+      - name: Build
+        run: cargo build --verbose
+      - name: Run tests
+        run: cargo test --verbose

.gitignore

@@ -19,3 +19,8 @@ target
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
 #.idea/
+
+
+# Added by cargo
+
+/target