Implementing `repeat` function

[prady0t]

What type of PR is this? (check all applicable)

• [ ] 💾 Refactor
• [x] 🪄 Feature
• [ ] 🐞 Bug Fix
• [ ] 🔧 Optimization
• [ ] 📚 Documentation
• [ ] 🧪 Test
• [ ] 🛠️ Other

Related issues

• Related issue #
• Closes #

Checklist

• [ ] Code follows style guide
• [ ] Tests added
• [ ] Documented the changes

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Part of the effort to adhere to array API standards. Similar to np.repeat but for sparse arrays.

[prady0t]

@hameerabbasi Will add tests after your reviews

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #875 will degrade performances by 29.65%

_{Comparing prady0t:array-api-tests-adherence (ea38652) with main (9988853)}

Summary

⚡ 2 improvements
❌ 1 regressions
✅ 337 untouched benchmarks

:warning: Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	test_gcxs_dot_ndarray[coo-m=200-n=200-p=200]	2.8 ms	2 ms	+42.81%
❌	test_index_fancy[side=100-rank=1-format='coo']	939.4 µs	1,335.2 µs	-29.65%
⚡	test_index_slice[side=100-rank=2-format='gcxs']	2.4 ms	2 ms	+21.97%

[prady0t]

Yes, there were a few bugs, mostly with reshaping. I've removed them and added the tests. Hopefully, this is a correct implementation. The function still doesn't account for uneven repeats.

[prady0t]

I think this is ready to be merged

[hameerabbasi]

Thanks, @prady0t!