[automation] track keycloak Provider schema Updates and New resources

[Breee]

The terraform provider is evolving every Release, i want to be able to automatically track New resources and schema Updates so we are ahead of people raising issues.

We can do this by comparing the old schema.json and the new schema.json for each Release.

I then probably also want to automatically create github issues in the next step.

A command in the makefile is good enough.