Capture ASP.NET Core logs

[KiarashS]

Add support for capturing logs of ASP.NET Core logging infrastructure with configurable log levels.
As a suggestion, Error and Critical levels can be considered as default.

[m0sa]

started poking at that in #135

[saithis]

It would be cool, if logs without an exception would be supported. Currently we would have to log them to somewhere else and check both places. It's much more comfortable to have a single place for exceptions and other logs.