1.1.0

feat: add subscriptionLimits field to Call type

Add an optional `subscription_limits` field to the `Call` type that surfaces
`SubscriptionLimits` data directly on call objects. This is a backward-compatible
addition — existing code that does not reference this field is unaffected.

Key changes:
- Add optional `subscription_limits` field (mapped from `subscriptionLimits`) to `Vapi::Types::Call`
- Field is typed as `Vapi::Types::SubscriptionLimits` and is nullable: false, optional: true

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