Let api_key endpoint authentication strategy add the api key to the query parameter

[dadrus]

Preflight checklist

• I agree to follow this project's Code of Conduct.
• I have read and am following this repository's Contribution Guidelines."
• I have discussed this feature request with the community.

Describe the background of your feature request

This is actually highly discouraged to do. And this is also the reason, why heimdall does not allow doing that. Unfortunately, there are however systems out there, which expect api keys in a query.

Describe your idea

Extend the api_keystrategy to allow the in parameter to be query. As of today, sending API keys is only supported in headers and cookies if an endpoint authentication strategy is used.

Are there any workarounds or alternatives?

Configure the endpoint directly with the required query parameter. Usage of environment variables is supported as of today as well. So a new option described above will just unify the configuration, without adding anything to the existing functionality.

Version

v0.7.0-alpha

Additional Context

No response