Additions for Chapter 17 Sustainable AI

[jaywonchung]

This PR does two things:

• Add existing efforts for ML energy measurement and optimization
• Add a piece of information regarding data gaps in the LCA section

CC @profvjreddi

Closes #143.

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[profvjreddi]

@jaywonchung Could you please take a look at the update I made?

If you agree, then I can merge this version.

Thanks for bringing this work to light. I wasn't aware of the ML.energy project, but now I am, and many others are! 👍

As you can see from my edits, I am trying to make sure we write about the topics broadly and then include specific examples as sample points. Welcome any thoughts/ideas/suggestions here.

[jaywonchung]

Your changes look good to me! Thanks!