Investigate/support pulling schemas from a URL

[PhillSimonds]

Environment

• Python version: 3.7.9
• schema-enforcer version: 1.0.1

Proposed Functionality

Support pulling a JSONSchema definition from a URL

---
$schema=https://my.url.to/the/schema

Use Case

If schemas have been defined in a central repository and are available via a URL, it would be nice to be able to acquire them from that URL rather than needing to store the schema locally.

[PhillSimonds]

This ticket was opened to investigate the use of schema enforcer in the way specified above. Schema Enforcer uses the python jsonschema library on the back end which may already support this feature. Even if this is the case, its use needs to be investigated, tested, and documented.