feat: add session affinity to k8s TS

[jagadeeshi2i]

Description

Adds session affinity to Torchserve Kubernetes setup.

pod-2.log
pod-1.log

The pod-2 get request with session_id=12346 and pod-1 get requests with session_id=12345

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Feature/Issue validation/testing

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[codecov]

Codecov Report

Merging #2519 (2324175) into master (448aad3) will not change coverage.
The diff coverage is n/a.

❗ Current head 2324175 differs from pull request most recent head 4247233. Consider uploading reports for the commit 4247233 to get more accurate results

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  Branches       58       58           
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  Misses        999      999           
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