(feat) Add remote-select question type and migrate data sources to o3 schema format

[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

Implements two changes:

1. Updates dataSources schema to align with o3 format while maintaining backwards compatibility
2. Adds support for remote-select question type control

Sample Schema

{
    "id": "admitToLocation",
    "type": "obs",
    "required": true,
    "label": "Admit to location",
    "questionOptions": {
        "rendering": "remote-select",
        "required": true,
        "concept": "CIEL:169403",
        "datasource": {
            "name": "location_datasource",
            "config": {
                "tag": "Admission Location"
            }
        }
    }
}

Screenshots

Related Issue

Other

[denniskigen]

Generally LGTM. Thanks, @donaldkibet! I've left some nitpicky suggestions around error handling and type annotations.

[makombe]

Thanks @donaldkibet LGTM!

[denniskigen]

LGTM