capi: expose authorizer runtime limits

[friel-openai]

Summary

• expose AuthorizerBuilder::set_limits through authorizer_builder_set_limits
• accept the fact, iteration, and execution-time limits without changing existing defaults
• verify from C that configured limits affect authorization

Testing

• cargo ctest --release

[divarvel]

Hi, thanks for your contribution! The c api is not used a lot directly these days, for FFI we’ve been favoring language-aware bindings like in biscuit-python or biscuit php.

Is this needed for integration with another language?