Vim: Change handleKeys to take a `mode`

[phrohdoh]

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Is this a BUG REPORT or FEATURE REQUEST?: Feature request

Changing handleKeys to take a mode (INSERT, NORMAL, VISUAL, etc) would allow greater customization and control over when vsc or vim should handle key events.

See #2056 as an example.

In normal mode pressing \

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Note: The behavior of \db are slightly different. I can elaborate more if necessary.

[bhorvath]

Adding the following to keybindings.json worked for me to map C-w to 'close window' in Normal mode and 'delete a word backwards' in Insert mode.

{
    "key": "ctrl+w",
    "command": "-extension.vim_ctrl+w",
    "when": "editorTextFocus && vim.active && vim.use<C-w> && !inDebugRepl"
}
{
    "key": "ctrl+w",
    "command": "extension.vim_ctrl+w",
    "when": "editorTextFocus && vim.active && vim.use<C-w> && vim.mode == 'Insert' && !inDebugRepl"
}