Get all custom emission groups with their emission factors for an organization
sk_live_1234567890abcdefff4adcc7-8172-45fe-9cf1-e90a6de53aa9a1b2c3d4-e5f6-7890-abcd-ef1234567890"org-uuid-here"group_name: Name of the groupgroup_id: UUID of the groupcategory: Category typedescription: Group descriptiongroup_start_date: Optional validity startgroup_end_date: Optional validity endghg_type: GHG origin type (1=fossil, 2=biogenic, 3=mixed)group_uploaded_by: Optional uploader referenceemission_factors: Array of emission factor objects (with full details including unit info and gas values)