Cognite-sdk

Added
Support for setting and fetching TimeSeries and Datapoints with "real" units (`unit_external_id`).
- TimeSeries has a new field `unit_external_id`, which can be set when creating or updating it. This ID must refer to a
valid unit in the UnitCatalog, see `client.units.list` for reference.
- If the `unit_external_id` is set for a TimeSeries, then you may retrieve datapoints from that time series in any compatible
units. You do this by specifying the `target_unit` (or `target_unit_system`) in a call to any of the datapoints `retrieve`
methods, `retrieve`, `retrieve_arrays`, `retrieve_dataframe`, or `retrieve_dataframe_in_tz`.

Fixed
- Serialization of `Transformation` or `TransformationList` no longer fails in `json.dumps` due to unhandled composite objects.

Added
- Support for metadata on Workflow executions. Set custom metadata when triggering a workflow (`workflows.executions.trigger()`). The metadata is included in results from `workflows.executions.list()` and `workflows.executions.retrieve_detailed()`.

Added
- Support for the UnitCatalog with the implementation `client.units`.

Fixed
- Calling some of the methods `assets.filter()`, `events.filter()`, `sequences.filter()`, `time_series.filter()` without a `sort` parameter could cause a `CogniteAPIError` with a 400 code. This is now fixed.

Added
- Convenience method `to_text` on the `FunctionCallLog` class which simplifies printing out function call logs.