[Feature][typescript-angular] useSingleRequestParameter missing on typescript-angular generator

Created by: djairhogeuens

Bug Report Checklist

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

Description

Compare https://openapi-generator.tech/docs/generators/typescript-fetch and https://openapi-generator.tech/docs/generators/typescript-angular

The Angular generator does not contain the useSingleRequestParameter

openapi-generator version

master

Suggest a fix

I can try to implement this myself but I will probably need some hints to get started as I am new to this project