Expose the comprehension iteration limit through cel.Options #112

Hi! It would be helpful to configure the comprehension iteration limit through the Python API. Expressions over large lists, especially with nested filter, map, or exists operations, can exceed the C++ runtime’s default iteration budget.

On current main, cel.Options only exposes enable_pratt_parser, and PyCelEnvInternal::BuildRuntime() doesn’t set comprehension_max_iterations.

Exposing it through cel.Options would allow something like:

env = cel.NewEnv(
    variables={"items": cel.Type.List(cel.Type.INT)},
    options=cel.Options(comprehension_max_iterations=100_000),
)