[SLO Routing] Add Latency Predictor sidecars and EPP tools

[BenjaminBraunDev]

This is stage 1 of 3 for adding in the latency prediction functionality to EPP.

Adds a new directory for the latency prediction and training sidecars for upcoming experimental latency prediction and SLO based routing scheduling profiles. Full details in issue below.

This does not change nor add any functionality as is, only introduces the sidecar module directory to be used to build the training and prediction images. These will later be deployed as containers alongside the EPP image.

Fixes #1323

Does this PR introduce a user-facing change?:

NONE 

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[kfswain]

/ok-to-test

[kfswain]

Made another pass!

I think most importantly, we need to remove the binary files unless there is a good reason to check them in.

Otherwise left some smaller comments, and it's looking good.