[comprehensive] Resource types for HTTP server.

This crate provides Resource types for use in a [comprehensive] Assembly. To use it, build an Assembly and include resources from this crate in the dependency graph.

HTTP (and HTTPS) Server

One or more HTTP servers can be run by including a Resource of type HttpServer<FooServer> where FooServer has derived [HttpServingInstance]. See the [server] module docs.

Diagnostics Instance

The [diag] module implements a [HttpServingInstance] specifically intended to serve content for diagnostics and other internal functions like metrics serving. The idea is that the endpoint for this server is not exposed to end users.