port PyComplex::from_complex to Bound API

[Icxolu]

Part of #3684

This ports the PyComplex::from_complex constructor of the num-complex interop to the Bound API

[codspeed-hq]

CodSpeed Performance Report

Merging #3866 will degrade performances by 10.2%

_{Comparing Icxolu:num-complex (db8e4b7) with main (f04ad56)}

Summary

⚡ 4 improvements
❌ 1 regressions
✅ 74 untouched benchmarks

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

Benchmarks breakdown

	Benchmark	main	Icxolu:num-complex	Change
⚡	extract_float_extract_success	500.6 ns	445 ns	+12.48%
⚡	extract_str_downcast_success	728.9 ns	645.6 ns	+12.91%
⚡	list_via_extract	364.4 ns	308.9 ns	+17.99%
❌	not_a_list_via_downcast	244.4 ns	272.2 ns	-10.2%
⚡	sequence_from_tuple	267.2 ns	239.4 ns	+11.6%

[davidhewitt]

Thanks, looks good to me too! Just one thing I spotted which maybe we should add here...

[davidhewitt]

Ooops we missed PyComplexMethods from the prelude too, mind adding at the same time please?

[Icxolu]

Good catch! Added it in another commit.