fix: enhance model imports for oneOf arrays in mustache templates

Author: GregoryMerlet

modules/openapi-generator/src/main/resources/typescript-fetch/modelOneOf.mustache

@@ -1,4 +1,13 @@
 {{#hasImports}}
+{{#oneOfArrays}}
+    import type { {{{.}}} } from './{{.}}{{importFileExtension}}';
+    import {
+    instanceOf{{{.}}},
+    {{{.}}}FromJSON,
+    {{{.}}}FromJSONTyped,
+    {{{.}}}ToJSON,
+    } from './{{.}}{{importFileExtension}}';
+{{/oneOfArrays}}
 {{#oneOfModels}}
 import type { {{{.}}} } from './{{.}}{{importFileExtension}}';
 import {

samples/client/petstore/typescript-fetch/builds/oneOf/models/TestArrayResponse.ts

@@ -12,6 +12,20 @@
  * Do not edit the class manually.
  */
 
+    import type { TestA } from './TestA';
+    import {
+    instanceOfTestA,
+    TestAFromJSON,
+    TestAFromJSONTyped,
+    TestAToJSON,
+    } from './TestA';
+    import type { TestB } from './TestB';
+    import {
+    instanceOfTestB,
+    TestBFromJSON,
+    TestBFromJSONTyped,
+    TestBToJSON,
+    } from './TestB';
 
 /**
  * @type TestArrayResponse