Labelbox

Added
* Search for data row ids from external ids without specifying a dataset
* `client.get_data_row_ids_for_external_ids()`
* Support for numeric metadata type

Updated
* The following `DataRowMetadataOntology` fields were renamed:
* `all_fields` -> `fields`
* `all_fields_id_index` -> `fields_by_id`
* `reserved_id_index` -> `reserved_by_id`
* `reserved_name_index` -> `reserved_by_name`
* `custom_id_index` -> `custom_by_id`
* `custom_name_index` -> `custom_by_name`

* Fix import error that appears when exporting labels

Added
* Bulk export metadata with `DataRowMetadataOntology.bulk_export()`
* Add docstring examples of annotation types and a few helper methods

Updated
* Update metadata notebook under examples/basics to include bulk_export
* Allow color to be a single integer when constructing Mask objects
* Allow users to pass int arrays to RasterData and attempt coercion to uint8

Removed
* data_row.metadata was removed in favor of bulk exports

Added
* Diagnostics custom metrics
* Metric annotation types
* Update ndjson converter to be compatible with metric types
* Metric library for computing confusion matrix metrics and iou
* Demo notebooks under `examples/diagnostics`
* COCO Converter
* Convert to and from COCO object and panoptic formats
* Detectron2 example integration notebooks

Fix
* Iam validation exception message

Added
* New `IAMIntegration` entity
* `Client.create_dataset()` compatibility with delegated access
* `Organization.get_iam_integrations()` to list all iam integrations available to an org
* `Organization.get_default_iam_integration()` to retrieve the default iam integration