Bump version to v3.0

Why these changes are being introduced:

The shift to elevating dataset metadata as an expected and required asset,
and utilizing DuckDB context's for metadata and data retrieval is a
sizable and breaking change.  Feels like this warrants a major version
bump.

How this addresses that need:
* Bumps internal library version to 3.0

Side effects of this change:
* `make update` commands from TIMDEX components will pickup this new version

Relevant ticket(s):
* https://mitlibraries.atlassian.net/browse/TIMX-537

Author: ghukill

timdex_dataset_api/__init__.py

@@ -4,7 +4,7 @@
 from timdex_dataset_api.metadata import TIMDEXDatasetMetadata
 from timdex_dataset_api.record import DatasetRecord
 
-__version__ = "2.3.0"
+__version__ = "3.0.0"
 
 __all__ = [
     "DatasetRecord",