Is your feature request related to a problem? Please describe.
No response
Describe the solution you'd like
#515 (comment) has a valid point.
For the InMemoryTaskStore not much can go wrong, but for the JpaDatabaseTaskStore there could be problems.
We should define an unchecked a2a-java exception, and update the TaskStore and TaskManger interfaces comments to say that these errors can happen if there is a problem connecting to the database/external storage mechanism.
Then we need to figure out what to do in these cases.
Describe alternatives you've considered
No response
Additional context
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