Refactor source output registration in IDE generator

[koenbeuk]

Update the source output registration method to use RegisterImplementationSourceOutput instead of RegisterSourceOutput for better performance

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[Copilot]

Pull request overview

This PR updates the incremental generator’s source emission registration to use Roslyn’s RegisterImplementationSourceOutput API instead of RegisterSourceOutput, aligning the generator with the intended “implementation output” pipeline and aiming to reduce IDE-time overhead.

Changes:

• Replaced context.RegisterSourceOutput(...) with context.RegisterImplementationSourceOutput(...) for the [Expressive] pipeline.
• Replaced context.RegisterSourceOutput(...) with context.RegisterImplementationSourceOutput(...) for the batched [ExpressiveFor*] emission pipeline.

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[github-actions]

⚠️ Performance Alert ⚠️

Possible performance regression was detected for benchmark 'ExpressiveSharp Benchmarks'.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 1.50.

Benchmark suite	Current: 481b59d	Previous: af72c8d	Ratio
ExpressiveSharp.Benchmarks.ExpressionResolverBenchmarks.Resolve_Constructor	20.635372799018334 ns (± 12.825022020518675)	7.571761826502866 ns (± 0.032731372760744275)	2.73

This comment was automatically generated by workflow using github-action-benchmark.