1.11.0

feat: add subscription_limits field to Call type

Add an optional `subscription_limits` field to the `Call` model that
exposes org-level subscription limits (including concurrency limit
information) at the time of a call. This surfaces a new `SubscriptionLimits`
type and wires it as an aliased optional field on `Call`.

Key changes:
- Add `SubscriptionLimits` import to `call.py`
- Add optional `subscription_limits` field (aliased as `subscriptionLimits`) to the `Call` model
- Field defaults to `None` and includes description of concurrency limit context

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