RequestConnector: support query params for requests and subrequests

[maghibus]

Extend the Request Connector to pass query parameters for both main requests and subrequests, including template substitution for subrequests.

What changed

• Added support for queryParameters in request configs and subrequest configs.
• Subrequest query params support tag replacement using the current data item.
• Request execution now includes params when query parameters are provided.
• Additional debug logging for request method/headers/params/data.
• Safer handling when subrequest processing returns a non-dict result.

Why

• Enables request/subrequest URLs to be parameterized without encoding values into the URL string.
• Improves flexibility for integrating with APIs that require query parameters.