[BUG] [Ruby] Initalize validation should apply to 'build_from_hash' too

Description

The changes to introduce better validation to the attributes hash in the initialize method, should also apply in the build_from_hash method.

openapi-generator version

$ docker run --rm openapitools/openapi-generator-cli version
4.2.3-SNAPSHOT

Steps to reproduce

1. Generate any ruby API
2. Build a hash with an incorrectly spelled attribute and create a model object with it.

E.g.

irb(main):012:0> Kubernetes::IoK8sApiBatchV1Job.new(api_version: 'batch/v1', kid: 'Job')
...
ArgumentError (`kid` is not a valid attribute in `Kubernetes::IoK8sApiBatchV1Job`. Please check the name to make sure it's valid. List of attributes: [:api_version, :kind, :metadata, :spec, :status])

vs

irb(main):013:0> Kubernetes::IoK8sApiBatchV1Job.build_from_hash(api_version: 'batch/v1', kid: 'Job')
=> #<Kubernetes::IoK8sApiBatchV1Job:0x000055ae59e2d238>

Related issues/PRs

https://github.com/OpenAPITools/openapi-generator/pull/2226

Suggest a fix

Factor out the validation code from initialize and either call it directly from the 'build_from_hash' method, and/or add a 'strictValidation' parameter to allow backward compatibility.

Start by locating the generated Ruby model's initialize and build_from_hash entry points, then compare how each handles an incorrectly spelled attribute such as kid. Done means build_from_hash rejects invalid attributes with the same validation behavior as initialize, while considering the suggested strictValidation option for backward compatibility.