Improve FilePathCollection usage

Hello!

First of all, thanks for this awesome project!

So, I want to request a very small feature that will make the usage of FilePathCollection better.
I have noticed that despite having this class, it seems that you use ICollection\ for everything.
I've runned in this in the AzurePipelinesPublishTestResultsData where I want to use the GetFiles to get all *.trx files and set it in the TestResultsFiles property, but I can't do it directly because it accepts ICollection\ and FilePathCollection despite the name doesn't implement it.

An easier way to do it would probably just be to implement the implicit operator.

What do you guys think?

Thanks!

Start by locating FilePathCollection and AzurePipelinesPublishTestResultsData, then inspect how TestResultsFiles currently accepts ICollection. The issue is done when FilePathCollection can be used directly for that property through the proposed conversion, with corresponding behavior covered by the project’s tests.

Written by the indexing model from the issue text.