[CAT-1552] Add missing document types (#135)

generators/java/okhttp-gson/templates/libraries/okhttp-gson/ApiClient.mustache

@@ -976,6 +976,7 @@ public class ApiClient {
             return params;
         }
 
+        @SuppressWarnings("unchecked"){{! Fix unchecked cast warning }}
         final Map<String, Object> valuesMap = (Map<String, Object>) value;
 
         for (Map.Entry<String, Object> entry : valuesMap.entrySet()) {

schemas/document_types/document_types.yaml

@@ -29,4 +29,50 @@ enum:
   - vehicle_registration_certificate
   - form_for_affixing_the_visa
   - identification_number_document
+  - adoption_certificate
+  - bank_building_society_statement
+  - bank_statement
+  - benefit_letters
+  - cbt
+  - certificate_of_sponsorship
+  - character_reference
+  - civil_partnership_certificate
+  - council_tax
+  - credit_card_statement
+  - deed_poll
+  - divorce_absolute_decree
+  - educational_statement
+  - electricity_bill
+  - gas_bill
+  - government_letter
+  - internet_bill
+  - marriage_certificate
+  - motorcycle_insurance
+  - national_insurance_card
+  - naturalisation_certificate
+  - non_uk_driving_licence
+  - p45_p60
+  - payslip
+  - phone_bill
+  - professional_identification_card
+  - right_to_work_share_code_result
+  - statement_fact
+  - t4_student_university_term_dates_evidence
+  - uk_biometric_residence_permit
+  - uk_driving_licence
+  - unknown
+  - utility_bill
+  - utility_bill_electric
+  - utility_bill_gas
+  - utility_bill_other
+  - water_bill
+  - address_certificate
+  - general_letter
+  - insurance_statement
+  - pension_property_statement_letter
+  - mortgage_statement
+  - mobile_phone_bill
+  - identity_document_with_address
+  - exchange_house_statement
+  - accommodation_tenancy_certificate
 type: string