Feature/di2

[arturcic]

That's the continuation of the #1861

What was done:

• Added Microsoft.Extensions.Hosting package that contains Hosting and DI, Configuration and Logging infrastructure. For now only the Hosting and DI is used.
• Reworked the Program.cs, now it uses the Generic Host with all the infrastructure goodies.
• Use the DI (maybe hosting) in the GitVersionTask
• null checks for injectable instances in constructors.

[gep13]

Just one main question...

[gep13]

LGTM!

[asbjornu]

I love the work you're doing here, @arturcic. Fantastic stuff! 👏 🎈 🎉 ❤️

[arturcic]

@asbjornu, I have fixed the code as you suggested, will continue the work on adding DI.

[arturcic]

@asbjornu, I have fixed the code as you suggested

[arturcic]

@asbjornu, I have finished with the DI changes to the code, can you have a last review? Thanks in advance, I know there is a lot of code ;)

[arturcic]

I have addressed all the tasks in the PR description

[asbjornu]

Fantastic work, @arturcic! 🙏 🎉 ❤️

[arturcic]

@asbjornu, I have applied the suggestions, so I guess the PR is more or less finished. I would prefer to address the remaining issues as part of other PRs, as I want to keep this PR for the introduction of DI and less for code refactorings. If you don't mind we can merge the code. What do you think?

[arturcic]

@asbjornu I will merge the PR. I haave set it to be version 5.1.0-beta