Investigate options for declarative "bean validation".

Create a declarative implementation:

• Update API (annotations, interceptors etc.)
• Implement Codegen
• Add support for new annotations to Helidon MP extension
• Add support to test new features (unless works out of the box)

See https://github.com/helidon-io/helidon/tree/main/declarative for list of expected container classes for each Helidon feature, and general approach to Helidon declarative modules.