Allan Siqueira

Add new configuration to preserve headers case

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Issue: #143 - Add new configuration to preserve headers case in Net::HTTP class - Add new configuration to preserve headers case in GenericRequest class

Config headers to not be capitalized

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## Context I am consuming a API that have case sensitive header keys. It is not common to see an case-sensitive header and also is off the [specification](https://developer.mozilla.org/en-US/docs/Glossary/HTTP_header). But sometimes...