Allow user to select metadata to skip

[vignaesh01]

A suggestion is to allow the VS Code User to specify in User Settings the concept of "Metadata to Skip during SELECT ALL" . My use-case is that I often want MOST metadata, but there are metadata types that I want to skip that your plugin does not skip, such as CustomObjectTranslation. I know I can uncheck them, but it would be nice if I could override the "SELECT ALL" to be "SELECT ALL EXCEPT XYZ"

Originally posted by @peternoges in https://github.com/vignaesh01/sfdx-package-generator/issues/5#issuecomment-587973442