add Bound constructors for PyByteArray and PyMemoryView

[Icxolu]

Part of #3684

The adds the Bound constructors for PyByteArray and PyMemoryView.

Since the original from constructor used as_ptr(), which returns a borrowed ptr, I used a borrowed &Bound for the new one. Please correct me if I'm wrong here.

[codspeed-hq]

CodSpeed Performance Report

Merging #3786 will improve performances by 12.92%

_{Comparing Icxolu:bytearray (b14dbcf) with main (6040d93)}

Summary

⚡ 1 improvements
✅ 78 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	Icxolu:bytearray	Change
⚡	not_a_list_via_downcast	242.8 ns	215 ns	+12.92%

[davidhewitt]

Brilliant, thank you yet again! Good pick to choose these ones; I'd totally forgotten they needed constructors added still.

Since the original from constructor used as_ptr(), which returns a borrowed ptr, I used a borrowed &Bound for the new one. Please correct me if I'm wrong here.

&Bound is exactly right based on what we've been doing elsewhere 👍

Just one tiny detail which is a suggestion to improve the surrounding code a tiny bit while we're there...

[davidhewitt]

Perfect, thanks again!

[davidhewitt]

Btw, if you are interested in some reviewing as well as coding, I've started keeping a list on #3684, some help getting those reviewed and merged would go a long way towards getting this new API shipped!

[Icxolu]

Btw, if you are interested in some reviewing as well as coding, I've started keeping a list on #3684, some help getting those reviewed and merged would go a long way towards getting this new API shipped!

I'll have a look and leave some comments.