add latency predictor and training sidecar modules

[BenjaminBraunDev]

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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[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: BenjaminBraunDev
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[BenjaminBraunDev]

@ahg-g @liu-cong @kfswain
Anything preventing this from being merged? if doesn't have any functional changes, just prepares later PRs for SLO routing.

[nirrozenbaum]

@ahg-g @liu-cong @kfswain Anything preventing this from being merged? if doesn't have any functional changes, just prepares later PRs for SLO routing.

@BenjaminBraunDev I don't think the PR has been reviewed yet, since most of maintainers/reviewers are currently focused in v1 release and bringing this version to a good state.
current PR is more than 4K LoC, and even though it doesn't add functional changes to EPP, it does add a lot of code that should be reviewed.
unfortunately due to time constraints, I think none of the maintainers can afford to spend the time reviewing 4k+ LoC at this point for PR that is not planned for v1.
having said that, we surely want to review and merge it as soon as possible, once we remove the high priority tasks from our plate.

[ahg-g]

Do we still need this PR now that you have it merged in a special branch?

[BenjaminBraunDev]

Do we still need this PR now that you have it merged in a special branch?

No we don't need it. We can cut this PR as obsolete.