Configuration of optional settings for Trimmomatic step ILLUMINACLIP

Implement a dialog opened on clicking of the "Optional" button in the ILLUMINACLIP settings widget (see UGENE-6095).

The dialog should have title "Configure ILLUMINACLIP Optional Settings".

The dialog layout should approximately as on the attached image "configure_illuminaclip_optional_settings.png" that is:

1. Checkable group "Provide optional settings" (unchecked by default) with two settings:
   • "Min adapter length" with a spin box value. The default value should be "8". Possible values - INT > 0.
   • "Keep both reads" with a combo box with values "True" and "False". The default value should be "False".
2. Button "Apply", "Cancel", "Help".

If the group check box is checked then a string produced by the "Configure Trimmomatic Steps" dialog should contain the specified additional settings, for example, "ILLUMINACLIP:TruSeq3-SE:2:30:10:8:true".