Cognite-sdk

Added
- Make properties on instances (`Node`, `Edge`) easier to work with, by implementing support for direct indexing (and a `.get` method).
If the instances have properties from no source or multiple sources, an error is raised instead. Example usage: `instance["my_prop"]`
(short-cut for: `instance.properties[ViewId("space", "ext.id", "version")]["my_prop"]`)

Added
- Data point subscriptions reaches General Availability (GA).
- Use the new [Data point subscriptions](https://developer.cognite.com/dev/concepts/data_point_subscriptions/)
feature to configure a subscription to listen to changes in one or more time series (in ingestion order).
The feature is intended to be used where data points consumers need to keep up to date with
changes to one or more time series without the need to read the entire time series again.
Changed
- Removed the `ignore_unknown_ids` flag from `client.time_series.subscriptions.retrieve()` to stay consistent with other resource types.

Fixed
- Data Workflows: mark parameter `jobId` as optional in `TransformationTaskOutput`, as it may not be populated in case of a failure.

Added
- Parameter `sort` to `client.documents.list`.

Fixed
- `DMLApplyResult` no longer fails when converted to a string (representation).

Fixed
- internal json encoder now understands CogniteObject and CogniteFilter objects, so that they are
correctly serialized when used in nested structures.