add eval after all to mosaicmllogger

[ethanma-db]

What does this PR do?

Add eval after all event to the mosaicmllogger to pass to Mapi. This should only trigger if there is some executing evaluator:

composer/composer/trainer/trainer.py

Line 2700 in 55f0b7d

def _run_evaluators(self, event: Event):

Adding from this doc:
https://docs.google.com/document/d/1Rk43aTNFXIUULs0OvTMQGXrV8bJkITmjICyGmMrF2Zc/edit?usp=sharing

What issue(s) does this change relate to?

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[b-chu]

Thanks for the PR!