add eval after all to mosaicmllogger

[ethanma-db]

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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: https://github.com/mosaicml/composer/blob/55f0b7d1880caaf218a56212e86f174bbc463d12/composer/trainer/trainer.py#L2700

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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