DMN FunctionDefinition parameter not trimmed by editor

Parameter are not trimmed by the editor

Acceptance criteria

• Add a parameter and before dismissing the dialog add spaces to it's start/end. Press tab.
  • The view should update to show the trimmed name.
  • Undoing the add parameter should remove the parameter.
  • Redoing should add it back.
• Add a parameter and dismiss dialog
• Edit parameters and add spaces to the start/end of the parameters name. Press tab.
  • The view should update to show the trimmed name.
  • Undoing the add parameter should remove the parameter.
  • Redoing should add it back.
• Edit parameters and change the parameters name. Press tab.
  • The view should update to show the new name.
  • Undoing the name change should restore the original name.
  • Redoing should restore the changed name.
• Add a parameter. Dismiss the dialog.
  • Undo should remove parameter. Redoing should add it back with the same name.