Refactor code to implement IncrementalGenerator

[StefH]

No description provided.

[Copilot]

Pull Request Overview

This PR refactors the FluentBuilderSourceGenerator to implement the IIncrementalGenerator interface instead of the older ISourceGenerator pattern. This modernizes the source generator architecture to use the newer, more efficient incremental generation model introduced in Roslyn.

• Updates from ISourceGenerator to IIncrementalGenerator pattern for better performance and caching
• Refactors syntax receiver logic to use incremental syntax providers
• Adds diagnostic reporting with specific error/info codes for better user feedback

Reviewed Changes

Copilot reviewed 83 out of 83 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
FluentBuilderSourceGenerator.cs	Core refactor from ISourceGenerator to IIncrementalGenerator with new pipeline setup
FluentBuilderSourceGeneratorTests.cs	Updates test methods to work with new generator interface and adds diagnostic validation
SyntaxReceiver files	Converts from receiver pattern to static methods for syntax node processing
Wrapper files	Removes context wrapper abstraction in favor of direct compilation helper
Various generator files	Updates to support new architecture and remove context dependencies

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