v1.1.0

feat: add SubscriptionLimits field to Call type

Add a new optional `SubscriptionLimits` field to the `Call` struct that
captures the organization's subscription limits (including concurrency
limit information) at the time the call was made.

Key changes:
- Add `SubscriptionLimits *SubscriptionLimits` field to `Call` struct
- Add `GetSubscriptionLimits()` accessor method on `*Call`
- Add `SetSubscriptionLimits()` setter that marks the field as explicitly set
- Add `callFieldSubscriptionLimits` bitmask constant for field tracking

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