Summary

Add a RemoteControl method to list available export_responses document types (core + plugin formats).

Problem

export_responses requires sDocumentType, but clients currently cannot discover valid values from the API.
This forces hardcoding and makes plugin-provided formats hard to use reliably.

Proposal

Add:

list_response_exports(sessionKey)

Return each available export type with metadata:

• type (value for export_responses)

• label (human-readable)

• pluginClass (provider)

  Example Response

  
  [
  {"type":"csv","pluginClass":"Authdb","label":"CSV"},
  {"type":"spsssav","pluginClass":"ExportSPSSsav","label":"SPSS (.sav)"},
  {"type":"spsssav_custom","pluginClass":"SpssExport","label":"SPSS (.sav) Custom"}
  ]
  
  ## Why

• Removes hardcoded assumptions in API clients

• Makes plugin export formats discoverable

• Reduces invalid export calls