refactor: migrate from Go to Rust implementation

.cargo/config.toml

@@ -0,0 +1,3 @@
+[env]
+CMAKE = "/opt/homebrew/bin/cmake"
+PATH = { value = "/opt/homebrew/bin:${PATH}", force = false }

.codacy.yml

@@ -0,0 +1,23 @@
+# Codacy configuration file
+# Exclude some warnings that are acceptable during refactoring phase
+
+exclude_paths:
+  - "target/**"
+  - "**/generated/**"
+  - "**/bindings/**"
+  - "examples/**"
+  - "README.md"
+  - "cli/README.md"
+  # Build scripts use subprocess with controlled build-time inputs only
+  - "python/functionstream-runtime/build.py"
+  - "python/functionstream-api/build_package.py"
+  # Ignore: apt pin versions, exec (required for Python module loading), pass style
+  - "Dockerfile"
+  - "python/functionstream-runtime/src/fs_runtime/runner.py"
+  - "python/functionstream-client/src/fs_client/exceptions.py"
+
+# Exclude some code quality checks (during refactoring phase)
+exclude_patterns:
+  - ".*unused.*"
+  - ".*complexity.*"
+  - ".*duplication.*"

.dockerignore

@@ -0,0 +1,19 @@
+target
+.git
+.github
+.gitignore
+*.md
+.env
+.env.*
+dist
+*.zip
+*.tar.gz
+.DS_Store
+.cursor
+examples
+*.pyc
+__pycache__
+.codacy.yml
+docker-compose.yml
+Dockerfile
+.dockerignore

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build-and-test:
+    name: Linux build and test
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+
+      - name: Install build dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y \
+            build-essential \
+            cmake \
+            libssl-dev \
+            pkg-config \
+            libsasl2-dev \
+            protobuf-compiler
+          # Verify cmake is available
+          cmake --version
+          which cmake
+
+      - name: Cache Cargo
+        uses: Swatinem/rust-cache@v2
+        with:
+          shared-key: "linux-build"
+
+      - name: Set CMAKE environment variable
+        run: |
+          echo "CMAKE=$(which cmake)" >> $GITHUB_ENV
+          echo "CMAKE set to: $(which cmake)"
+
+      - name: Generate protocol files
+        run: cargo check --package protocol
+
+      - name: Format generated code
+        run: cargo fmt --all
+
+      - name: Check format
+        run: cargo fmt --all -- --check
+
+      - name: Build
+        run: cargo build --all-targets --workspace
+
+      - name: Test
+        run: cargo test --workspace