add default dynamic hint namespaces

[lewisjkl]

Updates so that traits in smithy.api and alloy are always rendered with dynamic bindings. We can discuss the implications and alternatives to this in this PR.

PR Checklist (not all items are relevant to all PRs)

• [ ] Added unit-tests (for runtime code)
• [ ] Added bootstrapped code + smoke tests (when the rendering logic is modified)
• [ ] Added build-plugins integration tests (when reflection loading is required at codegen-time)
• [ ] Added alloy compliance tests (when simpleRestJson protocol behaviour is expanded/updated)
• [ ] Updated dynamic module to match generated-code behaviour
• [ ] Added documentation
• [ ] Updated changelog