feat: create rejection scenarios for HTTP.SYS and Kestrel

[DeagleGross]

Contains test to compare HTTP.SYS and Kestrel performance on some specific scenarios, where servers (probably) should reject the request early (i.e. mismatching Host header) to make request processing as performant as possible.

Scenario (name)	Description	Http.Sys (RPS)	Kestrel (RPS)
hostheader-mismatch	Sets non-matching "google.com" as Host header	4,840	2,303
header-symbols	Sets X-Custom: "Québec"	4,834	2,286
encoded-url	Includes encoded /%09 in URL	4,893	2,330