drop UseCreateChooser

[dimonovdd]

Description

API Changes

UseCreateChooser property has been deleted. It is not used after merging #82

public class MediaPickRequest
{
    /// <summary>Gets or sets whether to use Intent.CreateChooser. Currently used only for Android.</summary>
    public bool UseCreateChooser { get; set; } = true;
}

#82

PR Checklist

• All projects build
• Has samples
• Rebased onto current main

[beeradmoore]

There are 4 instances of UseCreateChooser in README.md. We should remove them so people don't complain about code that doesn't work when they copy/paste examples

[dimonovdd]

@beeradmoore we will need to write documentation to migration for new version.