Add QOL InventoryView#open method

[Y2Kwastaken]

This PR is fairly simple and just adds a open method to InventoryView. Seeing as InventoryView has a single non changeable non null player on it to begin with this is extremely nice with the InventoryViewBuilders.

// Before

player.openInventory(MenuType.GENERIC_9X3.builder()
	.location(location)
	.title(Component.text("This is my awesome InventoryView"))
	.build(player));

// After

MenuType.GENERIC_9X3.builder()
	.location(location)
	.title(Component.text("This is my awesome InventoryView"))
	.build(player)
	.open();