[OpenLineageDao] creating cache in code for sources to prevent upsert…

[jrosend]

This pull request introduces a caching mechanism for SourceRow objects in the OpenLineageDao to reduce redundant database upserts and improve performance. The main change is the addition of an in-memory cache and refactoring of the dataset upsert logic to utilize this cache. Below are the most important changes grouped by theme:

Performance Optimization

• Added a static in-memory cache SOURCE_ROW_CACHE to the OpenLineageDao interface to store and reuse SourceRow objects, minimizing repeated upsert operations for sources with the same name.

Code Refactoring

• Refactored the dataset upsert logic in upsertLineageDataset to use a new private helper method getOrUpsertSource, which checks the cache before performing an upsert and stores new sources in the cache. This replaces the previous logic that always performed a database upsert.

Imports

• Added HashMap import to support the new caching mechanism.