Standard Varadhi Header Configurability.

[anuj-flipkart]

1. Define Header Contract, where header names should be configurable.
2. Validate all the place where has been used and comparison of header check should be case insensitive. (Value should be exact match)

[bandeep18]

Define Header Contract, where header names should be configurable.

Header name & contracts & prefix
Limitations, Default behavior and other headers

Link for gromming https://docs.google.com/document/d/17tbZJnMWQu2vmPFNUxeXG0kfK9PiIfmGBIOCthzSTWs/edit?tab=t.0

Will add more details once we close gromming