Codec & serializer - initial implementation

.github/workflows/check-code-coverage.yml

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+name: Check code coverage
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+  workflow_dispatch:
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        runs-on: [ubuntu-latest]
+    runs-on: ${{ matrix.runs-on }}
+    name: Build
+    steps:
+      - uses: actions/setup-go@v5
+        with:
+          go-version: 1.20.7
+
+      - uses: actions/checkout@v4
+
+      - name: Run tests
+        run: |
+          go test -cover -coverprofile=coverage.txt -covermode=atomic -v ./...
+
+      - name: Upload coverage
+        run: bash <(curl -s https://codecov.io/bash) -f coverage.txt -y codecov.yml

.github/workflows/run-linter.yml

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+name: Run linter
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  golangci:
+    name: golangci linter
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-go@v5
+        with:
+          go-version: 1.20.7
+
+      - uses: actions/checkout@v4
+
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+          version: v1.53.2
+          args: --timeout 10m0s --max-issues-per-linter 0 --max-same-issues 0 --print-issued-lines
+          only-new-issues: true

.github/workflows/run-tests.yml

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+name: Run tests
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-go@v5
+        with:
+          go-version: 1.20.7
+
+      - uses: actions/checkout@v4
+
+      - name: Build
+        run: go build -v ./...
+
+      - name: Test
+        run: go test -v ./...