convert skip to iterate instead of call recursive functions

[davidhewitt]

The observation is that "skip" functionality shouldn't be hard to avoid function recursion because the return type is always (). So here's an attempted implementation. Should hopefully be faster...

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #111 will improve performances by 66.7%

_{Comparing dh/iter-skip (aa6b268) with main (366d16a)}

Summary

⚡ 4 improvements ✅ 69 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	dh/iter-skip	Change
⚡	big_jiter_skip	19.6 ms	17.5 ms	+11.87%
⚡	pass2_jiter_skip	3.5 µs	2.1 µs	+66.7%
⚡	short_numbers_jiter_skip	61 µs	55.1 µs	+10.7%
⚡	x100_jiter_skip	1.3 µs	1.2 µs	+10.11%

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 89.47368% with 6 lines in your changes are missing coverage. Please review.	Files	Patch %	Lines
crates/jiter/src/value.rs	89.47%	6 Missing :warning:

:loudspeaker: Thoughts on this report? Let us know!

[samuelcolvin]

This is great, thank you.