Event-model

What's Changed
* Switch from partials to classes by evalott100 in https://github.com/bluesky/event-model/pull/262
* Added to the schema extra of event_descriptor to allow precision to be null by evalott100 in https://github.com/bluesky/event-model/pull/277


**Full Changelog**: https://github.com/bluesky/event-model/compare/v1.19.4...v1.19.5

What's Changed
A slight fix to release [v1.19.3](https://github.com/bluesky/event-model/releases/tag/v1.19.3)
* Allow descriptor units to be null by coretl in https://github.com/bluesky/event-model/pull/275


**Full Changelog**: https://github.com/bluesky/event-model/compare/v1.19.3...v1.19.4

What's Changed
* Adopted the [bluesky pip python skeleton](https://github.com/bluesky/python3-pip-skeleton)
* Fixed validation errors in the schema in https://github.com/bluesky/event-model/pull/258
* Added event_counters as an optional kwarg to compose_run in https://github.com/bluesky/event-model/pull/257
* Introduced the skeleton method of versioning, removing _version.py in https://github.com/bluesky/event-model/pull/264
* Added unit test to test dots aren't accepted in keys in https://github.com/bluesky/event-model/pull/269
* Added typing support so mypy passes in https://github.com/bluesky/event-model/pull/247
* Documents can now be typed by their TypedDict, the jsonschema is the same but is generated from the TypedDicts.
* Use importlib resources instead of pkg_resources in https://github.com/bluesky/event-model/pull/273

New Contributors
* coretl made their first contribution in https://github.com/bluesky/event-model/pull/253
* DiamondJoseph made their first contribution in https://github.com/bluesky/event-model/pull/258
* dependabot made their first contribution in https://github.com/bluesky/event-model/pull/248
* ksunden made their first contribution in https://github.com/bluesky/event-model/pull/273

**Full Changelog**: https://github.com/bluesky/event-model/compare/v1.19.2...v1.19.3

Changed
-------

* Fix warnings about distutils being deprecated in Python>=3.10

====================

This release fixes compatibility with Python 3.7, which was inadvertently
broken in the previous release, 1.19.0.

====================

Added
-----

* Add two experimental new document types: a `stream_resource` that manages an
unknown number of contiguous `stream_datum`, with the potential for multiple
streams. This is especially relevant when the data is expected to be ragged
or has no pre-determined shape (number of rows).

Changed
-------

* Added ``object_name`` to Event Descriptor schema. The RunEngine has been
adding this for many years. This change merely documents the status quo.
* Use ``importlib`` instead of ``__version__`` to implement logic conditional
on jsonschema version.