Converts a single JSON Schema field to Skema field definition.

Converts JSON Schema properties to a Skema schema map.

Options

• atom_keys - Convert field names to atoms (default: false, uses strings for security)
• strict - When false, skip unsupported features instead of raising (default: false)
• default_type - Default type when type is not specified (default: :any)
• per_field_required - When true, check for per-field required property instead of required array (default: false)