Set typeLoose to false in JSON Validator

[chuwy]

Networknt JSON Schema validator has a configuration property called typeLoose which is set to true by default. This property makes validator compatible with OpenAPI specification and incompatible with official JSON Schema v4 specification.

This has two consequences:

1. Expected one. We want validation to be compatible with v4 and usually as strict as possible, typeLoose makes it not strict enough
2. Unexpected one. A bug mentioned in Bump json-schema-validator to 1.0.28 #121 exists only in typeLoose validator (null is not valid against nullable array with typeLoose false networknt/json-schema-validator#194), which means by disabling it we should get rid of the bug