[Feature Request] Configurable cursor style

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This is a FEATURE REQUEST:

Description:
VsCode allows setting the cursor style like this:

"editor.cursorStyle": "line"

I would like to be able to customize the cursor style for the different vim modes as well. For example, I would like to be able to do this:

"vim.normalModeCursorStyle": "underline"

Implementation Details:

In the mode classes (ex: src/mode/modeNormal.ts), instead of hardcoding the cursorType, read it from the user settings.