[BUG][Ada] Wrong style for generated Ada model types and missing security scopes

Created by: stcarrez

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• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
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Description

The generated type names for the data model are incorrect as they don't follow the Ada style. We have now:

ObjectType

instead of

Object_Type

openapi-generator version

4.1.0

OpenAPI declaration file content or url

Command line used for generation

Steps to reproduce

Related issues/PRs

Suggest a fix

I've fixed this in my fork and will submit a pull request soon.