BAMLAdapter for formatting Ash Resources in prompt (instead of json_schema)

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Is your feature request related to a problem? Please describe.

recently, dspy merged a BAML adapter which is a different way of formatting the classes in python when sending them in prompt.

Current default way to do that is json_schema. Which becomes too verbose when json schema is nested.

BAML gives 5% improvement over JsonSchema approach as shown in the PR.

Describe the solution you'd like

Todo: Implement BAMLAdapter as opt-in to replace json_schema formatting of ash resources.

Describe alternatives you've considered

No response

Additional context

No response