Feat/add jsonschema extensions

[tomhollingworth]

Issue

Extending the JSON schema is difficult due to "additionalProperties": false on entities.

Extending AllSchema.json only provides two easy options; add extensions directly into AllSchema.json or maintain a file that lists every specific override.

• Editing AllSchema.json prevents encapsulating extensions to definitions in a single file to maintain separation between original defintion and extensions,
• Maintaining a file of every specific parent override file is very repetitive, cumbersome and doesn't follow the DRY principal. For example, consider an extension to EquipmentType with a new attribute "Color": {"type": "string"}. I would need to change all occurences of EquipmentType and override; GetEquipment, ProcessEquipment.... e.g.

{
    "$id": "B2MML_schema_extension.json",
    "$schema": "http://json-schema.org/2020-12/schema#",
    "title": "ODH - B2MML Schema extensions",
    "type": "object",
    "allOf": [
        {
            "$ref": "AllSchemas.json"
        }
    ],
    "properties": {
        "GetEquipment": {
            "properties": {
                "DataArea": {
                    "properties": {
                        "Equipment": {
                            "type": "array",
                            "items": {
                                "properties": {
                                    "Color": "string"
                                }
                            }
                        }
                    }
                }
            }
        },
        "ProcessEquipment": {
            "properties": {
                "DataArea": {
                    "properties": {
                        "Equipment": {
                            "type": "array",
                            "items": {
                                "properties": {
                                    "Color": "string"
                                }
                            }
                        }
                    }
                }
            }
        },
        ... other usages, e.g. ChangeEquipment, SyncEquimpent, AcknowledgeEquipmentType, CancelEquipment...
    }
}

Proposal

Introduce a new file for easy extension and update existing JSON schema to references the easy extension file. This change makes use of unevaluatedProperties attribute on original entities and drops additionalProperties.

❗️This proposal does introduce a dependency on the extension schema file being present to avoid warnings/errors, which previously didn't exist.

Add

• Add a new AllSchema-Extensions file B2MML-AllExtensions.schema.json that can be used to extend entities.
• Add allOf to include the extension file to allow

Change

• Renamed AllSchema.json to AllSchema.schema.json
• Changed Definitions in AllSchema.schema.json swap "additionalProperties": false for "unevaluatedProperties": false,

Example Usage