feat: add list_as_array flag to MarshmallowPlugin for array-root requestBody
#982
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OpenAPI 3.x fully supports request bodies whose root schema is an array, but apispec + marshmallow currently cannot generate such schemas automatically. Projects must hand-write YAML/dict snippets for every endpoint that needs it.
This PR introduces an opt-in flag—list_as_array—to MarshmallowPlugin that lets the plugin emit type: array schemas automatically when:
The default behaviour remains unchanged (object-root), so the change is non-breaking.