Enable creation of Unit-test components based on a normal engine component

#### Description:

For creation of datadriven unit-tests, it would be handy if one could simply turn a normal BHoM component into a UnitTest component via the rightclick menu.

This could significantly speed up the process of going from a working test-script into datadriven unit tests, without having to search up the correct method (and arguments) again and re-stich all the wires together.

Suggesting addition of a meny item that essentially lets you make a "copy" of the component, but as a unit test, and that then adds it to the document.

Start by tracing how normal BHoM components expose their right-click menus and how UnitTest components are added to a Grasshopper document. Define the conversion behavior, including preserving the method and arguments, then verify that the copied component appears as a UnitTest component with its existing wires intact.

Written by the indexing model from the issue text.