Kestrel error messages should include body size information with "Request body too large" exception

[jkotalik]

In HttpsSys, when the request body size was too large, it throws an exception with information about the size limits ex:

"System.IO.IOException: The request's Content-Length 15 is larger than the request body size limit 10."

while Kestrel's message is simply:

Microsoft.AspNetCore.Server.Kestrel.Core.BadHttpRequestException: Request body too large.

Kestrel should probably include this information.

[jkotalik]

See: https://github.com/aspnet/KestrelHttpServer/blob/6584a8b5fdaba0a79c52b981cac88472bcc92d1a/src/Kestrel.Core/BadHttpRequestException.cs#L74-L75