Improve/modernize MediaPicker

[jfversluis]

For .NET 10 we want to look into modernizing and maybe (slightly) improving MediaPicker.

First goal is to use the modern APIs for each platform so that the MediaPicker is in a working state again. From there we can work towards adding the missing functionality when compared to Xamarin.Essentials, MediaPlugin and MediaGallery. We probably can't do all of that at once, so priority here will be to implement bits so that people can help themselves.

For instance: we surface the EXIF information of a file so that people can rotate images themselves rather than providing the APIs to rotate automatically. As time permits, we might add more or less features.

Please vote on the individual linked issues by leaving a 👍 on the initial post so we can prioritize accordingly, note that we will always have the final decision in what gets added as we take into account other factors that influence how much we can get done with this.

You can help us review the resulting PRs as well as pulling down the resulting NuGets from PRs, test those and provide early feedback!