Add support for azure function

[dupdob]

Description

This PR adds support for AzureFunctionProject

A simple integration test project is provided as well.

The logic change is: buildalyzer now keeps the first compilation step, disregarding its origin or the last compilation step when triggred by the main project file. AzureFunction project triggers a compilation step from a temporary subproject to generate a dummy assembly (which purposes has not been identified) and which should not be reported.

[dupdob]

I think the example project would benefit from some more descriptive/representative naming.

like what? It is an AzureFunction project. I mean: what info is missing?

[phmonte]

@dupdob Thank you for contributing, we are evaluating the PR, I saw that it is related to a Stryker issue, we will try to finalize it as quickly as possible.