chore: new rspack source bench case

[SyMind]

This PR adds a new benchmark case for rspack source operations by splitting the existing complex_replace_source benchmark into two separate benchmarks: one for source maps and one for source content.

Key Changes:

• Split benchmark_complex_replace_source into two distinct benchmark functions
• Updated imports to reflect the new benchmark function names

[codspeed-hq]

CodSpeed Performance Report

Merging #187 will not alter performance

_{Comparing new-rspack-source-bench-case (5e5011c) with main (07c2e81)}

Summary

✅ 8 untouched
🆕 2 new
⏩ 5 skipped¹

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
🆕	complex_replace_source_map	N/A	55.4 ms	N/A
🆕	complex_replace_source_source	N/A	2.8 ms	N/A

Footnotes

1. 5 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. ↩

[Copilot]

Pull Request Overview

This PR adds a new benchmark case for rspack source operations by splitting the existing complex_replace_source benchmark into two separate benchmarks: one for source maps and one for source content.

Key Changes:

• Split benchmark_complex_replace_source into two distinct benchmark functions
• Updated imports to reflect the new benchmark function names

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