Add support for multiline header in response

[eyalsatori]

Following this discussion - I saw that the server send me a set-cookie header with multiline value (CLRF in the middle of the cookie).

this is print from curl output:

Set-Cookie: ___utmvbBNuXKscZ=DZc
XfeOcall: LtO; path=/; Max-Age=900; Secure; SameSite=None

I saw that hyper support multiline header by configuration , and I thought maybe it's can be added also as ClientBuilder flag .

If you ok with this attitude , I will start to working on PR .. (I think it's should be pretty convenient - I will follow the path of http1_title_case_headers )

[alexsatori]

Such "malformed" cookies are generated by a WAF for detection purposes. So there is a good reason to support it in the library.

https://stackoverflow.com/questions/62170999/weird-malformed-cookies-returned-from-rest-api-sometimes

[eyalsatori]

Added in #1523