Features/777-argsort and testcase

[GG-yuki]

Description

add argsort and test case( not test yet due to device)

Issue/s resolved: #777

Changes proposed:

• add argsort and testcase

Type of change

• New feature

Memory requirements

Performance

Due Diligence

• All split configurations tested
• Multiple dtypes tested in relevant functions
• Documentation updated (if needed)
• Updated changelog.md under the title "Pending Additions"

Does this change modify the behaviour of other functions? If so, which?

no

[mtar]

GPU cluster tests are currently disabled on this Pull Request.

[ghost]

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Legend

[ClaudiaComito]

@GG-yuki thanks a lot for this PR and apologies it's taken us so long to get back to you.

The tests are failing, do you need help with that?

Cheers,

Claudia

[ClaudiaComito]

I'm going to close this PR, as the tests fail and it seems to need significantly more work. Will be addressed after merging #749 . Still, @GG-yuki thanks for the time you put into this.