Get Executor Config Schema

Get configuration schema for a specific executor type.

Returns detailed information about each configuration field including:

• name: Field name
• type: Data type (str, int, Decimal, enum, etc.)
• description: Field description
• required: Whether the field is required
• default: Default value if any
• constraints: Validation constraints (min, max, pattern, etc.)
• enum_values: Possible values for enum types

Also returns nested type definitions for complex fields.