[BUG] [typescript-angular] local package installation fails because of link issue

Created by: MBcom

Bug Report Checklist

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

Description

if you install the generated typescript angular package locally like described in the README.md then you ran in trouble on windows if the version of the api packages changes
so installing the build tgz bundle instead induced npm to copy the generated files to the node_modules folder instead of symlinking them

the bug bevaviour is actually described in the README.md

the linked pull request solves this issue

openapi-generator version

4.0.0

OpenAPI declaration file content or url

Command line used for generation

Steps to reproduce

run

npm install --save <Path to api package>

change something on the api package, do some git commits on an other machine like an unix based system, pull the changes and install the new api package again - the new changes are not adopted
see https://github.com/angular/angular-cli/issues/8284

Related issues/PRs

look at the linked pr

Suggest a fix

look at the linked pr