Nylas

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* Improved message sending and draft create/update performance
* Change default timeout to match API (90 seconds)

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* Added support for `round_to` field in availability response
* Added support for `attributes` field in folder model
* Added support for icloud as an auth provider
* Fixed webhook secret not returning on creation of webhook
* Fixed issue with free busy and scheduled message responses not being deserialized correctly
* Removed `client_id` from `detect_provider()`

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* Fix deserialization error when getting token info or verifying access token
* Fix schemas issue in the `Event` and `CodeExchangeResponse` models

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* **BREAKING CHANGE**: Python SDK v6 supports the Nylas API v3 exclusively, dropping support for any endpoints that are not available in v3
* **BREAKING CHANGE**: Drop support for Python < v3.8
* **BREAKING CHANGE**: Dropped the use of 'Collections' in favor of 'Resources'
* **BREAKING CHANGE**: Removed all REST calls from models and moved them directly into resources
* **BREAKING CHANGE**: Models no longer inherit from `dict` but instead either are a `dataclass` or inherit from `TypedDict`
* **BREAKING CHANGE**: Renamed the SDK entrypoint from `APIClient` to `Client`
* **REMOVED**: Local Webhook development support is removed due to incompatibility
* Rewrote the majority of SDK to be more intuitive, explicit, and efficient
* Created models for all API resources and endpoints, for all HTTP methods to reduce confusion on which fields are available for each endpoint
* Created error classes for the different API errors as well as SDK-specific errors

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* Fix error when trying to iterate on list after calling count
* Fix error when setting participant status on create event

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* Add support for verifying webhook signatures
* Add optional parameter for token-info endpoint