Yanking selection in visual block mode does not update `0` register

Describe the bug
In Vim, when you yank text, it updates the 0 (zero) register with the text you've yanked. In VSCodeVim, this behavior is broken for text selected in visual block mode (Ctrl+V); the 0 register is not updated.

To Reproduce
Steps to reproduce the behavior:

1. Enter the text abc def in your editor, and move the cursor to the a and press Esc to enter "normal" mode.
2. Type yw to yank the text abc using the w movement.
3. Type w⎈vlly, where ⎈v represents Ctrl+V, to move to the text def, select it in visual block mode, and yank it.
4. Type o⎈r0, where ⎈r represents Ctrl+r, to open a new line and paste the contents of the 0 register.

Expected behavior
The text def is pasted, which is what happens in Vim.

Actual behavior
The text abc is pasted.

Environment (please complete the following information):

• Extension Name: vim
• Extension Version: 1.18.5
• OS Version: Darwin x64 19.6.0
• VSCode version: 1.52.1

{
	"messages": [],
	"activationTimes": {
		"codeLoadingTime": 39,
		"activateCallTime": 0,
		"activateResolvedTime": 0,
		"activationReason": {
			"startup": true,
			"extensionId": {
				"value": "vscodevim.vim",
				"_lower": "vscodevim.vim"
			},
			"activationEvent": "*"
		}
	},
	"runtimeErrors": []
}

Reproduce the Ctrl+V visual-block yank sequence in VSCodeVim and trace how yanks update the 0 register. Add coverage for the stated yw followed by visual-block y sequence, then verify that opening a line and pasting register 0 produces def rather than abc.