ENH: Implement broadcast_to function

[mtsokol]

Hi @hameerabbasi,

This PR adds broadcast_to Array API function.

It it only broadcasts missing dimensions, for 1-size dimension it can't broadcast as it's a limitation of linalg.broadcast in MLIR.

It also provides some simple logic for inferring output sparse format.

[codspeed-hq]

CodSpeed Performance Report

Merging #782 will improve performances by ×2.2

_{Comparing broadcast_to-func (e46cd64) with main (fbdd5c7)}

Summary

⚡ 1 improvements
✅ 339 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	broadcast_to-func	Change
⚡	test_index_fancy[side=100-rank=1-format='coo']	1,427.5 µs	640.2 µs	×2.2