[1.x] Implement new shard pick-up API introduced by `core-java`.#181

Merged

ndolhii merged 7 commits intov1from

Apr 19, 2023

Commits on Apr 18, 2023

Update own version and use `1.9.0-SNAPSHOT.11` of `core-java`.
Nick Dolhii
committed
Throw `DatastoreException` instead of hiding it.
Nick Dolhii
committed
Implement new API.
Nick Dolhii
committed

Commits on Apr 19, 2023

Assert `AlreadyPicked` in tests.
Nick Dolhii
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Update javadoc, reformat code.
Nick Dolhii
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Make methods actually throw exceptions.
Nick Dolhii
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Change the test name and description according to the code changes.
Nick Dolhii
committed