add scoring preference to scorer interface.

[nirrozenbaum]

this is a pre-req for adapting scorer weights

What type of PR is this?
/kind feature

What this PR does / why we need it:
This is a pre-req for experimenting with #1992.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

When implementing a scorer, the developer should declare if the scorer preference is affinity based on some cache or other state, or even load distribution.
Not changing anything in the user experience, only for the developer of scorers.

/cc @kfswain @vMaroon

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nirrozenbaum

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[nirrozenbaum]

@vMaroon updated names

[kfswain]

/lgtm

I think this is a great step towards understanding scorers better, thanks Nir!

[nirrozenbaum]

rebased

[kfswain]

/lgtm