[Feature Request]: Web services lookup to Support WSDLs with nested imports or other WSDLs

### What would you like to happen?

If my WSDL has imported some other WSDLs within it then I want Web services lookup control to support them as well. My WSDL has some imports like below ,

`


`

Currently, it throw an error saying File Not found. Below is the error,

` Caused by: javax.wsdl.WSDLException: WSDLException (at /wsdl:definitions/wsdl:import[1]): faultCode=OTHER_ERROR: Unable to resolve imported document at 'GenericEntityService?wsdl=Common_interface_1_1.wsdl'.: java.io.FileNotFoundException: This file was not found: file:/C:/Softwares/apache-hop-client-2.5.0/hop/GenericEntityService?wsdl=Common_interface_1_1.wsdl`

I hope / wish to see this support in future.

@bamaer

### Issue Priority

Priority: 3

### Issue Component

Component: Hop Gui, Component: Pipelines

Start at the Web services lookup control in the Hop GUI and reproduce the failure with the provided WSDL and nested wsdl:import locations. Trace how imported documents are resolved, then verify that the example imports load successfully instead of producing FileNotFoundException.

Written by the indexing model from the issue text.