Add Status Page with DotvvmConfiguration

[exyi]

To simplify configuration debugging, we should add a page that will dump the contents of DotVVM Configuration in a readable way. Most importantly, it should contain the items which are usually autoconfigured (like registered controls, routes, resources, ...).

With improvements like #535, it would be also helpful to list DotvvmProperties and capabilities of each control.

[quigamdev]

This can be part of the diagnostics status page (https://github.com/riganti/dotvvm-samples-compilation-status-page)