Allow ignoring certain TS suggestion-level diagnostic codes

Related to what was discussed in https://github.com/Microsoft/vscode/issues/61326.
Would provide more granularity to the settings introduced with https://github.com/Microsoft/vscode/pull/46590.

It might be useful to introduce a new setting to ignore certain suggestion diagnostic codes while still keeping suggestion diagnostics enabled, rather than having to disable them altogether.

What I'm proposing is to introduce 2 new settings, javascript.suggestionActions.ignoredCodes and typescript.suggestionActions.ignoredCodes. These would take a list of suggestion diagnostic codes that the user wants to ignore, given as a string of either comma- or space-separated code numbers.

Example:

{
  // ...

  "typescript.suggestionActions.enabled": true,
  "typescript.suggestionActions.ignoredCodes": "7043, 80006"

  // ...
}

This list would only be checked when a suggestion-level diagnostic is received, so including non-suggestion-level diagnostic codes in the list would have no effect (errors and messages would not be ignored).

Start by reviewing the related VS Code issue #61326 and pull request #46590, then trace how suggestion-level diagnostics and the existing suggestionActions settings are handled. Done means the proposed JavaScript and TypeScript ignored-code settings accept comma- or space-separated codes and affect only suggestion-level diagnostics.