chore: embed SpannerLib in ADO.NET driver

[olavloite]

Embed the relevant code from SpannerLib in the ADO.NET driver to remove the need to create nuget packages for SpannerLib. This change also includes scripts for copying the relevant code, and for building the required binaries for the driver.

[gemini-code-assist]

Summary of Changes

Hello @olavloite, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly refactors the Google Cloud Spanner ADO.NET driver's dependency model by embedding the SpannerLib source code and its native gRPC server binaries directly within the driver project. This change aims to streamline the build and distribution process, reduce external NuGet package dependencies, and provide a more self-contained solution. It involves adding the SpannerLib source, introducing scripts to manage its lifecycle (copying source, building binaries), and updating the project configuration to include these embedded components and their native runtime assets.

Highlights

• SpannerLib Embedding: The core SpannerLib functionality is now embedded directly into the ADO.NET driver, eliminating external NuGet package dependencies for SpannerLib.
• Dependency Simplification: Removed Alpha.Google.Cloud.SpannerLib and its related GRPC/Native implementation package references from the .csproj file.
• New Source Files: Introduced numerous C# files (AbstractLibObject.cs, Connection.cs, ISpannerLib.cs, Pool.cs, Rows.cs, SpannerException.cs, GrpcBidiConnection.cs, GrpcLibSpanner.cs, StreamingRows.cs, Server.cs, SpannerlibGrpc.cs) that constitute the embedded SpannerLib.
• Build and Copy Scripts: Added shell scripts (build-binaries.sh, copy-spannerlib-source.sh, spanner-lib-version.sh) to automate the process of fetching SpannerLib source, building native gRPC server binaries, and copying them into the project structure.
• Runtime Inclusion: The .csproj file now explicitly includes native runtime binaries for various platforms (Linux x64/arm64, OSX arm64, Windows x64) directly within the NuGet package.
• Codebase Refactoring: The SpannerPool.cs file was updated to remove references to the now-removed native SpannerLib implementation, exclusively utilizing the embedded gRPC implementation.

Ignored Files

• Ignored by pattern: .github/workflows/** (1)
  • .github/workflows/ado-net-tests.yml

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[gemini-code-assist]

Code Review

This pull request embeds the SpannerLib into the ADO.NET driver, removing the need for external NuGet packages. The changes involve adding the SpannerLib source code, updating project references, and including scripts for copying source and building native binaries. The overall approach aligns with the goal of self-containment. However, there are several areas related to asynchronous programming patterns and exception handling that require attention to prevent potential deadlocks and ensure consistent error propagation.

[bhatt4982]

LGTM...