Added language setting option to skip runtime schema compilation

[aderende]

Duplicate of #967, fixed CI build

What does this PR do?

It adds skipSchemaValidation settings to enable/disable JSON schema validation.

By default, skipSchemaValidation is false, but if the integrator always calls configure with skipSchemaValidation = true, then the code schema07Validator = ajv.compile(jsonSchema07) will never get called. This allows the browser to avoid adding the unsafe-eval policy directive.

What issues does this PR fix or reference?

The ajv.compile(...) function requires the unsafe-eval policy directive for the script-src policy. eclipsesource/jsonforms#1498

The skipSchemaValidation setting allows the application to avoid compiling the schema validator and prevents the need to use the unsafe-eval policy.

Is it tested? How?

A test case with skipSchemaValidation enabled has been added.