feat: API Keys

[mosesintech]

Is your feature request related to a problem? Please describe.

If we will build a calendar plugin for WordPress, it might be helpful to have it interact with our calendar API so it will need an API key.

Describe the solution you'd like to see

We can use Unkey's generous free tier to generate API keys to be used in that plugin.

Describe alternate solutions

Will explore alternatives later.

Additional information

No response