feat: support string parameters in permits

[stonelgh]

To support string paramters and string literal arguments in permits definition

Related issue(s)

#1113

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  security@ory.sh) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[CLAassistant]

All committers have signed the CLA.

[zepatrik]

Hey, thanks for putting all of this work in!
We have to consider the impacts of this for all planned and upcoming features though, as it might interfere with those. Because that is non-trivial, it might take some time. We have already thought about a similar feature btw: #319 (comment)

[stonelgh]

Got that. Let me know if you need assistance.