ENH: Implement reshape function

[mtsokol]

Hi @hameerabbasi,

This PR adds Array API reshape function (without copy keyword for now).

Unfortunately calling sparse.reshape(...) gives a segmentation fault (on exit) - I haven't figured out it yet.

[codspeed-hq]

CodSpeed Performance Report

Merging #776 will improve performances by 19.89%

_{Comparing reshape-func (9325477) with main (373f29f)}

Summary

⚡ 5 improvements
✅ 335 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	reshape-func	Change
⚡	test_elemwise[f=<built-in function add>-backend='Finch'-side=100]	862.4 µs	719.4 µs	+19.89%
⚡	test_elemwise[f=<built-in function add>-backend='Finch'-side=500]	1,027.2 µs	884.4 µs	+16.15%
⚡	test_elemwise[f=<built-in function mul>-backend='Finch'-side=1000]	828 µs	735.2 µs	+12.62%
⚡	test_elemwise[f=<built-in function mul>-backend='Finch'-side=100]	788.5 µs	694.8 µs	+13.48%
⚡	test_elemwise[f=<built-in function mul>-backend='Finch'-side=500]	811.1 µs	711.2 µs	+14.05%

[mtsokol]

@hameerabbasi The PR is ready from my side. For now reshape only works on CSF and CSR formats. For other ones it's broken (there are skips in the test with relevant links pointing to issues).

[hameerabbasi]

Two minor changes.