feat(core): forward bound kwargs in RunnableBinding.__getattr__

[Mohammad Mohtashim (keenborder786)]

• RunnableBinding.getattr now forwards bound kwargs to delegated methods that accept **kwargs.
• Previously, only bound config was passed to the underlying runnable's methods. Now, bound kwargs are also forwarded to methods with **kwargs, with explicit kwargs taking precedence.

runnable.bind(foo="bar").some_method(baz="qux")
# some_method receives: foo="bar", baz="qux"

Use case was identified in #35320

[codspeed-hq]

Merging this PR will improve performance by 25.43%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚡ 1 improved benchmark
✅ 12 untouched benchmarks
⏩ 27 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	WallTime	test_async_callbacks_in_sync	20.5 ms	16.3 ms	+25.43%

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_{Comparing keenborder786:mmk/bound_parameters (6e139e2) with master (90d015c)}

Footnotes

1. 27 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩