Implement IHttpResource (microsoft#9484)

* Added HttpResource skeleton

* Import WINRT namespaces

* Use custom struct instead of folly:dynamic in IHttpResource

* Drop factory method from Beast HTTP resource

* Move WinRT conversion utils into header

* Move WinRT conversion utils into header

* Define class WinRTHttpResource

* Update HttpModule

* Define IHttpResource::Response

* Implement callback members

* Implement AbortRequest

* Implement multiple request handling

* Drop client argument from PerformSendRequest

* Use background thread in PerformSendRequest

* Add WinRTConversions.cpp

* Init resource in module

* Implement test RequestGetSucceeds

* Complete RequestGetSucceeds

* Complete RequestGetFails

* Add HttpModule to default modules

* Move resume_in_queue back to WebSocket resource

* Simplify WinRTConversions includes

* Rename runtime option to Http.UseResourcedModule

* clang format

* Change files

* Update x86 DLL boundary

* Using SetRtOpt in InitModule

* Add test RequestGetHeadersSucceeds

* Allow aborting server

* Use case-insensitive comparison for headers

* Collect both response and content headers

* Address feedback

* Remove member function HttpModule::SendEvent

* Remove SetOnRequest

* Delete Beast HTTP resource

* Catch specific exceptions where applicable

* Rename Add/Remove Request to Track/Untrack Response

* Use r-value references where applicable

* Set runtime option Http.UseMonolithicModule

* Define GetHttpModuleName and GetWebSocketModuleName

* Remove WS, HTTP and Timing from Desktop test runner

* Update XHRTest

* Implement cxxCallback

* Pass request ID to callbacks

* Set default TestStatus for TestResult

* Update XHR test

* Format XHR test

Author: JunielKatarn

change/react-native-windows-7bb307e0-b40f-48f0-a356-a43c860eeefb.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Implement IHttpResource",
+  "packageName": "react-native-windows",
+  "email": "julio.rocha@microsoft.com",
+  "dependentChangeType": "patch"
+}