init: Add LP/Sparse libraries, tools, and CI

Initial import of libraries and command-line tools for handling LP metadata and Android sparse images. Adds LibLpSharp (metadata builder, reader/writer, geometry/format types), LibSpraseSharp (sparse image/stream utilities and validators), protobuf-generated DynamicPartitionsDeviceInfo, CLI tools (LpDump, LpMake, LpUnpack), solution and project files, a comprehensive .gitignore, and a GitHub Actions .NET build workflow. The MetadataBuilder implementation includes partition/group management, extent allocation, resizing logic, and export to LpMetadata.

Author: 13584452567

.github/workflows/dotnet.yml

@@ -0,0 +1,28 @@
+# This workflow will build a .NET project
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-net
+
+name: .NET
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: 10.0.x
+    - name: Restore dependencies
+      run: dotnet restore
+    - name: Build
+      run: dotnet build --no-restore
+    - name: Test
+      run: dotnet test --no-build --verbosity normal