Reduce conflict errors on number generation #2258
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Description of the issue/feature this PR addresses
This PR reduces conflict errors that might occur if multiple threads are requesting new numbers at the same time.
Current behavior before PR
storage was fetched before the lock was acquired
Desired behavior after PR is merged
storage is always fetched from the annotation storage
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I confirm I have tested this PR thoroughly and coded it according to PEP8
and Plone's Python styleguide standards.