Vscode-spell-checker: Add "Toggle Spell Checking for Workspace" command

[blackwind]

I'd like to see a toggle command, cSpell.toggleForWorkspace, so I can bind it to a single keyboard shortcut.

[Jason3S]

There are a few commands I plan on adding as well:

• enable(ForWorkspace)
  -- turn on spell checker (for the workspace)
• disable(ForWorkspace)
  -- turn off spell checker (for the workspace)
• toggle(ForWorkspace)
  -- toggle on / off the spell checker (for the workspace).
• enableCurrentLanguage(ForWorkspace)
  -- turn on checking the language of the current document.
• disableCurrentLanguage(ForWorkspace)
  -- turn off checking the language of the current document.
• toggleCurrentLanguage(ForWorkspace)
  -- toggle on / off the current language

[Jason3S]

Update: I still think this is a good idea, I just haven't had the time to do it. I am open for pull requests.

[Jason3S]

All the commands have been added except for toggleCurrentLanguage.