Adding the rest of WebTransport into Kestrel (#42097)

AspNetCore.sln

docs/README.md

docs/WebTransport.md

src/Http/Http.Features/src/IHttpWebTransportFeature.cs

src/Http/Http.Features/src/IWebTransportSession.cs

...tp.Features/src/Microsoft.AspNetCore.Http.Features.csproj

src/Http/Http.Features/src/PublicAPI.Unshipped.txt

src/Middleware/Middleware.slnf

src/Servers/Kestrel/Core/src/CoreStrings.resx

.../Core/src/Internal/Http/HttpProtocol.FeatureCollection.cs

.../Kestrel/Core/src/Internal/Http/HttpProtocol.Generated.cs

src/Servers/Kestrel/Core/src/Internal/Http/HttpProtocol.cs

...ervers/Kestrel/Core/src/Internal/Http3/Http3Connection.cs

...ers/Kestrel/Core/src/Internal/Http3/Http3ControlStream.cs

.../Kestrel/Core/src/Internal/Http3/Http3ControlStreamOfT.cs

...ers/Kestrel/Core/src/Internal/Http3/Http3PendingStream.cs

...el/Core/src/Internal/Http3/Http3PendingStreamException.cs

src/Servers/Kestrel/Core/src/Internal/Http3/Http3Stream.cs

...ers/Kestrel/Core/src/Internal/Http3/Http3StreamContext.cs

...Servers/Kestrel/Core/src/Internal/Http3/Http3StreamOfT.cs