Changes the existing imports filter to omit static imports and adds a
new static imports filter to omit non-static imports.

Change-Id: I7572af8ad18f7cfba95aa0b5159e7faab185ea69
Signed-off-by: Julian Ruppel <julian.ruppel@sap.com>
Reviewed-on: https://git.eclipse.org/r/c/jdt/eclipse.jdt.ui/+/179870
Tested-by: Sarika Sinha <sarika.sinha@in.ibm.com>
Tested-by: Vikas Chandra <Vikas.Chandra@in.ibm.com>
Reviewed-by: Sarika Sinha <sarika.sinha@in.ibm.com>
Reviewed-by: Vikas Chandra <Vikas.Chandra@in.ibm.com>