Start one background worker on first DuckDB query #544
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Up until now, we were starting the background worker as part of the extension.
The problem with this approach is that it imposes a unique worker, and thus cannot updated multiple database.
In preparation to have one BGW per database, this PR triggers the start of a background worker when
IsExtensionRegisteredis called and the cache is populated.We've prevented potential race conditions that would cause two bgw to start by checking a lock on a temporary file.
Note: a following PR will actually start one BGW per database