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Fix InMemoryJournalWriter: do not anonymize objects by default

Description

Fix InMemoryJournalWriter: do not anonymize objects by default

908f0154 introduced an unexpected change of behavior of the
InMemoryJournalWriter, making it always anonymize objects. This broke
tests for some dependencies (esp. swh-storage).

This fix adds an 'anonymize' (bool) argument to the class constructor
(similar to the KafkaJournalWriter).