Code Quality: Added 'object? parameter' to every rich commands

[0x5bfa]

Resolved / Related Issues

To prevent extra work, all changes to the Files codebase must link to an approved issue marked as Ready to build. Please insert the issue number following the hashtag with the issue number that this Pull Request resolves.

• Related Feature: Support custom args for actions #15141

Steps used to test these changes

Stability is a top priority for Files and all changes are required to go through testing before being merged into the repo. Please include a list of steps that you used to test this PR.

1. Opened Files
2. Run one rich command to check if the command won't cause a crash

[0x5bfa]

After this and #15299 get merged, we can get started to work on using RichCommands with parameter here (CreateNewFileCommand):

Files/src/Files.App/Data/Factories/ContentPageContextFlyoutFactory.cs

Lines 634 to 658 in cc0a770

	if (!string.IsNullOrEmpty(i.IconBase64))
	{
	// loading the bitmaps takes a while, so this caches them
	byte[] bitmapData = Convert.FromBase64String(i.IconBase64);
	using var ms = new MemoryStream(bitmapData);
	var bitmap = new BitmapImage();
	_ = bitmap.SetSourceAsync(ms.AsRandomAccessStream());
	list.Add(new ContextMenuFlyoutItemViewModel()
	{
	Text = i.Name,
	BitmapIcon = bitmap,
	Command = commandsViewModel.CreateNewFileCommand,
	CommandParameter = i,
	});
	}
	else
	{
	list.Add(new ContextMenuFlyoutItemViewModel()
	{
	Text = i.Name,
	Glyph = "\xE7C3",
	Command = commandsViewModel.CreateNewFileCommand,
	CommandParameter = i,
	});
	}

This is one big step!