(feat) : initial work to bring appointment model to form engine

[donaldkibet]

Requirements

• This PR has a title that briefly describes the work done, including the ticket number if there is a ticket.
• My work conforms to the OpenMRS 3.0 Styleguide and design documentation.
• My work includes tests or is validated by existing tests.

Summary

This PR forms initial work to bring support of managing appointment. The roadmap includes the following

• Initial schema enhancement to support creating and editing appointments
• Add the workload distribution calendar to the form engine
• Add ability to create re-curing appointments together
• Unit and e2e test for the feature

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Related Issue

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[ojwanganto]

With this in the form engine, we can reduce the number of fields one has to fill by providing some defaults i.e. for the appointment type and status fields. We can make those defaults configurable in the form schema.
As a bonus, we can probably show how many appointments are scheduled on a date on change of the appointment date. I think a count will suffice

[ojwanganto]

How do we want to handle updates to appointments when a form is edited? Do we even want to support this?

[donaldkibet]

At the moment, in edit mode, the form submits the edited fields, we can further enhance the form engine to check if the initial value have changed and submit the new changes

On the distribution calendar, thats the next feature am thinking of adding