[feature]: Support CRUD for Pages via the API

[benr77]

Is there an existing issue for this?

• [X] I have searched the existing issues

Summary

According to the API documentation there are currently no endpoints to manage Pages.

Why should this be worked on?

This would be a really useful addition - our use case is that we want to centralise documentation in Pages, but we have some docs in our code repositories that we'd like to publish into Plane via the API from e.g. our CI pipelines.

[fungus75]

From my point of view at least READ and GETPDF would be very helpful: Allows AI integration to use Plane-Pages as Knowledge-Base.