Replace JsonSchema with OpenApiSchema

[MaggieKimani1]

This PR:

• Uninstalls JsonSchema.NET library from the core and Readers project
• Refactors the entire codebase by replacing the JsonSchema object from JsonSchema.NET with our native OpenApiSchema implementation that supports all V2, V3, and V31-specific keywords.
• Adds support for pattern properties keyword in line with JSON schema.
• Adds support for the examples keyword in the OpenApiSchema object in line with JSON schema as the example property has been deprecated in favor of it.
• Enables local and external document dereferencing using JSON pointer to component as well as $ref to $id by:
  • Refactoring component registry to use id as a locator when registering schemas in the registry and performing lookups during reference resolution.
  • Creating an OpenApiSchemaReference object that acts as a proxy for lazy schema reference resolution
• Refactors to use JsonNode in place of OpenApiAny for Enums and Examples
• Adds tests for validation and refactors existing tests.

Issues resolved
#1789
#1790
#1791
#1792
#1793

[sonarcloud]

Quality Gate failed

Failed conditions
74.9% Coverage on New Code (required ≥ 80%)
D Reliability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

Catch issues before they fail your Quality Gate with our IDE extension SonarLint