Status Bar *Item* Color Control

[jeslinmx]

Is your feature request related to a problem? Please describe.
The current implementation of Status Bar Color Control is subject to many intrinsic, unsolvable limitations, bugs and side effects by nature of its implementation and the capabilities of the VSCode extension API.

Describe the solution you'd like
An alternative implementation of status bar color control that only changes the text color of the status bar item (StatusBarItem.color)

With this, there is no mucking about with the user's settings.json, eliminating side effects, unexpected behaviour, and potential for performance degradation, with the trade-off that the change is not as visually pronounced.

Describe alternatives you've considered

• Changing the backgroundColor of the StatusBarItem
  • this is discouraged by the VSCode UX guidelines and explicitly kneecapped by the extension API, presumably for this reason.
  • this exact idea had previously been shelved for this reason (Make vim.statusbarcolors only affect the mode string. #1839)
  • In contrast, StatusBarItem.color can be set to an arbitrary color or ThemeColor.

Additional context
Add any other context or screenshots about the feature request here.