Implement FluentWorklist.transfer method

[michaelosthege]

• 🆕 Implements FluentWorklist.transfer, with wash_scheme: Optional[int]. If wash_scheme=None, a .flush() is used instead of a .wash().
• 🚚 Tests of large volume handling were moved such that they can be reused for both worklist types.

FluentWorklist can now be used, and is also covered by tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (394a740) 95.05% compared to head (1a72b6d) 95.37%.
Report is 1 commits behind head on master.

❗ Current head 1a72b6d differs from pull request most recent head 112cb67. Consider uploading reports for the commit 112cb67 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #57      +/-   ##
==========================================
+ Coverage   95.05%   95.37%   +0.31%     
==========================================
  Files          18       18              
  Lines        1051     1102      +51     
==========================================
+ Hits          999     1051      +52     
+ Misses         52       51       -1     

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