Custom Component: multi mat-select with user defined options

[SchoolGuy]

Is your feature request related to a problem? Please describe.
A user should be able to easily select options in a list and define custom options in it.

Describe the solution you'd like
A custom component das has the following features:

• Based on mat-select
• Works with single and multi-select
• Searchbox for options
• Options can be removed, added or edited after the initial render
• Ideally: Use arrow_drop_up and arrow_drop_down to order the selected options

Describe alternatives you've considered
Currently, we use a helper solution in many places that allows sorting input fields and a remove button to delete input fields. This is not a very good experience and takes up a lot of space.

Additional context
None.