Add Support to Claude 4.5 Models

[mscully4]

Is your feature request related to a problem? Please describe.
The Sonnet 4.5 models have been out for a few months and I would like to use them as part of Amplify application, however I can't because they aren't in the model enum yet

Describe the solution you'd like
Add Haiku & Sonnet 4.5

Describe alternatives you've considered
N/A

Additional context
Model enum is defined here: https://github.com/aws-amplify/amplify-data/blob/c5d4e1dc4c8f1740ce88303977191e880f99f043/packages/data-schema/src/ai/ModelType.ts

[ahmedhamouda78]

Hey @mscully4, thank you for opening this feature request. We will take a look and come back to you once we have any updates.