docs: adds JSDoc to the npm package '@ory/keto-namespace-types'

[nidomiro]

Adds JSDoc to the npm package '@ory/keto-namespace-types'.
This will enable displaying what the different methods do in the IDE as documentation

Related issue(s)

None

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. (not needed in my opinion)
• I have added or changed the documentation. (not needed in my opinion)

Further Comments

Please give feedback if my understanding of the PermissionLanguage is correct

[zepatrik]

This is a great idea, thanks a lot 😍

[vinckr]

@nidomiro
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