feat(ls): add rules for OpenAPI 2.0 Items Object (#3622)

Refs #3605

Author: char0n

packages/apidom-ls/src/config/codes.ts

@@ -735,6 +735,23 @@ enum ApilintCodes {
   OPENAPI2_PARAMETER_FIELD_ENUM_TYPE = 3101800,
   OPENAPI2_PARAMETER_FIELD_MULTIPLE_OF_TYPE = 3101900,
 
+  OPENAPI2_ITEMS = 3110000,
+  OPENAPI2_ITEMS_FIELD_TYPE_EQUALS = 3110100,
+  OPENAPI2_ITEMS_FIELD_TYPE_REQUIRED,
+  OPENAPI2_ITEMS_FIELD_FORMAT_TYPE = 3110200,
+  OPENAPI2_ITEMS_FIELD_ITEMS_TYPE = 3110300,
+  OPENAPI2_ITEMS_FIELD_ITEMS_REQUIRED,
+  OPENAPI2_ITEMS_FIELD_COLLECTION_FORMAT_EQUALS = 3110400,
+  OPENAPI2_ITEMS_FIELD_MAXIMUM_TYPE = 3110500,
+  OPENAPI2_ITEMS_FIELD_EXCLUSIVE_MAXIMUM_TYPE = 3110600,
+  OPENAPI2_ITEMS_FIELD_MINIMUM_TYPE = 3110700,
+  OPENAPI2_ITEMS_FIELD_EXCLUSIVE_MINIMUM_TYPE = 3110800,
+  OPENAPI2_ITEMS_FIELD_MAX_LENGTH_TYPE = 3110900,
+  OPENAPI2_ITEMS_FIELD_MIN_LENGTH_TYPE = 3111000,
+  OPENAPI2_ITEMS_FIELD_UNIQUE_ITEMS_TYPE = 3111100,
+  OPENAPI2_ITEMS_FIELD_ENUM_TYPE = 3111200,
+  OPENAPI2_ITEMS_FIELD_MULTIPLE_OF_TYPE = 3111300,
+
   OPENAPI3_0 = 5000000,
 
   OPENAPI3_0_OPENAPI_VALUE_PATTERN_3_0_0 = 5000100,

packages/apidom-ls/src/config/openapi/config.ts

@@ -34,6 +34,7 @@ import swaggerMeta from './swagger/meta';
 import tagMeta from './tag/meta';
 import xmlMeta from './xml/meta';
 import pathTemplateMeta from './path-template/meta';
+import itemsMeta from './items/meta';
 import schemaMeta from '../common/schema/meta';
 import ApilintCodes from '../codes';
 
@@ -83,6 +84,7 @@ export default {
   swagger: swaggerMeta,
   tag: tagMeta,
   xml: xmlMeta,
+  items: itemsMeta,
   schema: schemaMeta,
   'path-template': pathTemplateMeta,
 };