feat(cargo-codspeed): add internal build mode

[not-matthias]

No description provided.

[codspeed-hq]

Merging this PR will degrade performance by 19.27%

Summary

❌ 8 regressed benchmarks
✅ 360 untouched benchmarks
⏩ 207 skipped benchmarks¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	WallTime	from_elem_decimal[1024]	80 ns	83 ns	-3.61%
❌	WallTime	sleep_1ms	1 ms	1.1 ms	-3.19%
❌	WallTime	graph_coloring[4]	1 µs	1.1 µs	-9.25%
❌	Simulation	find_highest_set_bit[255]	122.2 ns	151.4 ns	-19.27%
❌	Simulation	find_highest_set_bit[42]	122.2 ns	151.4 ns	-19.27%
❌	Simulation	find_highest_set_bit[65535]	122.2 ns	151.4 ns	-19.27%
❌	Simulation	find_highest_set_bit[1024]	122.2 ns	151.4 ns	-19.27%
❌	Simulation	process_items_with_counter	806.7 ns	835.8 ns	-3.49%

---

_{Comparing cod-1865-improve-dx-of-memory-profiling-alias-with-instrumentation (7242105) with main (0afd168)}

Footnotes

1. 207 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. ↩