grouping large vector tests based on their type and adding their nightly test function

[access2rohit]

Description

Grouped large vector tests for large tensor support into 3:

• tensor (creation and manipulation)
• nn (neural network)
• basic (arithmetic and logical)

calling 4 groups separately in nightly run so memory is freed by after every group run.

Description

(Brief description on what this PR is about)

Checklist

Essentials

Please feel free to remove inapplicable items for your PR.

• Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage:
• Unit tests are added for small changes to verify correctness (e.g. adding a new operator)
• Nightly tests are added for complicated/long-running ones (e.g. changing distributed kvstore)
• Build tests will be added for build configuration changes (e.g. adding a new build option with NCCL)
• Code is well-documented:
• To the best of my knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change

Comments

Currently running, will update once they finish

[access2rohit]

@mxnet-label-bot add [pr-awaiting-review]

[access2rohit]

@apeforest @ChaiBapchya PR is ready for review

[ChaiBapchya]

Retriggered unix-cpu and unix-gpu for you (both had 1 job that timed out due to 4hr+ run) Suspicious why the time-outs have resurfaced.

Also awaiting to see results posted of running these nosetests on your test machine. Thanks
Rest LGTM!

[apeforest]

LGTM