fix: prevent dangling references in dict and listCallbackProperties

[iisakkirotko]

Description

While implementing viewer closing in glue-jupyter, I found that ListCallbackProperty and DictCallbackProperty would often have a dangling references to instances of objects that use them. Using a weakref in referencing those objects will let them be garbage collected.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.70%. Comparing base (d4d9d2f) to head (864d9d8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #43   +/-   ##
=======================================
  Coverage   96.70%   96.70%           
=======================================
  Files          18       18           
  Lines        2274     2279    +5     
=======================================
+ Hits         2199     2204    +5     
  Misses         75       75           

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[dhomeier]

Thanks, implementation looks good, though I am not deeply familiar with the use case.

1. Please rebase this as well to get the linux-ci tests.
2. Could a test be added to test_containers.py to check the type the callback uses, or maybe even that garbage collection works?