[DMN Designer] Search feature - DMN Data Types must be searchable elements

Currently, the search component indexes only GDT cells, DRG elements, and Boxed Expressions. It must index Data Types too.

Acceptance test

On both Firefox and Chrome

• Search when data types collapsed collapsed.webm
  • in re-review
• Search in nested structures, Structure in Structure
• Search Constraints
• Search Is List
• Search data type, edit it, save, continue search search-edit.webm
  • DROOLS-4419
• Search data type, remove it same as above
  • DROOLS-4419
• Search data type, matches that needs scrolling
• Search Data Type, Search Model, Search Data Type
  • the issue of switching search context is that it assumes the context of previous screen until you press enter
  • in re-review
• Search DataType, Switch to Model->Expression, keyboard shortcuts need to work