Purge MOE operators

[reyna-abhyankar]

Description of changes:

In some places, it is commented out because aggregate was used as an example for implementation of something that has not been completed. I've left it as an example and it should be removed once completed

Related Issues:

Linked Issues:

• Issue #

Issues closed by this PR:

• Closes Purge MoE operators (Aggregate, AggregateSpec, GroupBy) #1127

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This change is 

[lockshaw]

Reviewed 41 of 41 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @lambda7xx, @reyna-abhyankar, and @wmdi)

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lib/runtime/src/task_spec.cc line 109 at r1 (raw file):

}

// TODO: deprecate

Why? (add a link in the code to a github issue with explanation)

[reyna-abhyankar]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @lambda7xx, @lockshaw, and @wmdi)

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lib/runtime/src/task_spec.cc line 109 at r1 (raw file):

Previously, lockshaw (Colin Unger) wrote…

Why? (add a link in the code to a github issue with explanation)

I've changed get_signature in the op task PR. We can actually just delete this code

[lockshaw]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @lambda7xx and @wmdi)