Show supported runners on extension detail page

[pascalberger]

Follow up of https://github.com/cake-build/website/issues/580 and https://github.com/cake-build/website/issues/299. With the combination of Cake version the addin references and TFM we can decide with which runners it is compatible with based on the supported platform table. An addin should be classified as compatible with a runner as soon as it targets a TFM, which is compatible with a runner. It shouldn't matter if an addin targets netstandard2.0 or e.g. multi-targets net641 and netcoreapp3.0.

This is of course only from a technical point of view, it's still possible that e.g. an addin targeting netstandard2.0 doesn't work on Cake .NET Tool on Linux. We should mention this in a tooltip.

Addin targeting .NET Standard 2.0:

Addin multi-targeting:

Add referencing latest Cake version but doesn't support all runners:

Addin referencing old Cake version and TFM:

[pascalberger]

This probably can be done in Addin Discoverer as part of the compliance score calculation (https://github.com/cake-contrib/Cake.AddinDiscoverer/issues/156) and written to YAML file