[BUG] typescript-axios doesn't export models when withSeparateModelsAndApi flag is true

Created by: benwiley4000

Bug Report Checklist

Have you provided a full/minimal spec to reproduce the issue?
[N/A] Have you validated the input using an OpenAPI validator (example)?
What's the version of OpenAPI Generator used? 5.0.0-SNAPSHOT
Have you search for related issues/PRs?
What's the actual output vs expected output?
[Optional] Bounty to sponsor the fix (example)

Description

I'm using the typescript-axios generator with the withSeparateModelsAndApi flag:

withSeparateModelsAndApi: true
apiPackage: 'api'
modelPackage: 'model'

Basically, when using this, the models aren't exported from the root package:

// index.d.ts
export * from "./api";
export * from "./configuration";

However both the API classes and models are correctly included with the default setup which uses a single file for everything. It would be desirable to export the models in all cases. The separate-file structure is much nicer for editors that are slow processing large files.

openapi-generator version

5.0.0-SNAPSHOT

OpenAPI declaration file content or url

See above

Command line used for generation

Steps to reproduce

Related issues/PRs

Suggest a fix

Just export the modelPackage directory as well, don't think it's super complicated.

ETA: Apologies for not editing the description when I first posted this.

ETA Again: withSeparateModelsAndApi: true - I accidentally included false before because that was the config I was debugging with. Sorry for being sloppy today!