[typescript-axios]: withSeparateModelsAndApi handles importFileExtension (#22032)

Separate models are located in `modelPackage` folder with `index.ts` file. ESM requires an index file with the provided extension when `importFileExtension` is defined.

Author: izorg

modules/openapi-generator/src/main/resources/typescript-axios/apiInner.mustache

@@ -22,7 +22,7 @@ import { DUMMY_BASE_URL, assertParamExists, setApiKeyToObject, setBasicAuthToObj
 import { BASE_PATH, COLLECTION_FORMATS, type RequestArgs, BaseAPI, RequiredError, operationServerMap } from '{{apiRelativeToRoot}}base{{importFileExtension}}';
 {{#imports}}
 // @ts-ignore
-import type { {{classname}} } from '{{apiRelativeToRoot}}{{tsModelPackage}}{{importFileExtension}}';
+import type { {{classname}} } from '{{apiRelativeToRoot}}{{tsModelPackage}}{{#importFileExtension}}/index{{importFileExtension}}{{/importFileExtension}}';
 {{/imports}}
 {{/withSeparateModelsAndApi}}
 {{^withSeparateModelsAndApi}}

modules/openapi-generator/src/main/resources/typescript-axios/index.mustache

@@ -5,4 +5,4 @@
 
 export * from "./api{{importFileExtension}}";
 export * from "./configuration{{importFileExtension}}";
-{{#withSeparateModelsAndApi}}export * from "./{{tsModelPackage}}{{importFileExtension}}";{{/withSeparateModelsAndApi}}
+{{#withSeparateModelsAndApi}}export * from "./{{tsModelPackage}}{{#importFileExtension}}/index{{importFileExtension}}{{/importFileExtension}}";{{/withSeparateModelsAndApi}}