Allow to change double click select expand mode to whole word select

<!-- ⚠️⚠️ Do Not Delete This! feature_request_template ⚠️⚠️ --> <!-- Please read our Rules of Conduct: https://opensource.microsoft.com/codeofconduct/ --> <!-- Please search existing issues to avoid creating duplicates. --> <!-- Describe the feature you'd like. --> Allow to configure double click selection expand mode for selection whole words. Currently first double clicking on a word then holding shift and single click results this behavior:  Expected behavior whole **word** selection mode (for example default in atom)