Change JsonSchemaPrimitive to a class

[VitaliiMaltsev]

What

Currently all jdbc connectors can provide only primitive json types
( STRING, NUMBER, OBJECT, ARRAY, BOOLEAN, NULL)

and json schema looks like

{ "type": "string" },
{ "type": "number" }

How

Created JsonSchemaType class to construct json schema with any parameters.
Please find the details in the RFC document.

Recommended reading order

1. JsonSchemaType.java
2. JdbcSourceOperations.java

The rest of the files just include JsonSchemaPrimitive to JsonSchemaType replacement.

🚨 User Impact 🚨

There should not be visible user impact

Pre-merge Checklist

Expand the relevant checklist and delete the others.

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[tuliren]

Cool. Looks good in general.

One major thing is that currently it is possible to construct an invalid JsonSchemaType instance. This class and its builder can be refactored to eliminate that possibility.