perf: optimized request headers (#1335)
* Optimizes header registration.
* Adds malformed cookie tests.
* Sets key to NULL (releasing them is unnecessary)
* Adjusts test.
* Sanitizes null bytes anyways.
* Sorts headers.
* trigger
* clang-format
* More clang-format.
* Updates headers and tests.
* Adds header test.
* Adds more headers.
* Updates headers again.
* ?Removes comments.
* ?Reformats headers
* ?Reformats headers
* renames header files.
* ?Renames test.
* ?Fixes assertion.
* test
* test
* test
* Moves headers test to main package.
* Properly capitalizes headers.
* Allows and tests multiple cookie headers.
* Fixes comment.
* Adds otter back in.
* Verifies correct capitalization.
* Resets package version.
* Removes debug log.
* Makes persistent strings also interned and saves them once on the main thread.
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Co-authored-by: Alliballibaba <alliballibaba@gmail.com>
