Adding filter list on FileSystemWatcher

[renatochitolina]

Hello!

Since Core 3.x, we have a filter list on the FileSystemWatcher, to provide an easy way to handle multiple file types.

var watcher = new FileSystemWatcher();
watcher.Filters.Add("*inbound*.xlsx");
watcher.Filters.Add("*inbound*.csv");

Would be possible to consider adding it to next versions?

[fgreinacher]

Thanks for the hint! We currently don't target .NET Core. As .NET Standard and .NET Core will converge into .NET 5 soon-ish I'd like to add this when we build the first .NET 5 package 👍

[fgreinacher]

Blocked by #633

[github-actions]

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