fix: add locking for a number of finalizers

[blaugold]

Fixes #407

[codecov]

Codecov Report

Merging #412 (1b1c3b9) into main (f58fa34) will increase coverage by 0.02%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##             main     #412      +/-   ##
==========================================
+ Coverage   74.65%   74.67%   +0.02%     
==========================================
  Files         144      144              
  Lines       12608    12613       +5     
==========================================
+ Hits         9412     9419       +7     
+ Misses       3196     3194       -2     

Flag	Coverage Δ
e2e.cbl	89.09% <100.00%> (+0.01%)	⬆️
unit.cbl	2.85% <0.00%> (-0.01%)	⬇️
unit.cbl_dart	16.04% <0.00%> (ø)
unit.cbl_generator	31.62% <0.00%> (-0.03%)	⬇️
unit.cbl_sentry	9.41% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/cbl_ffi/lib/src/replicator.dart	62.81% <50.00%> (-2.13%)	⬇️
...ckages/cbl/lib/src/replication/ffi_replicator.dart	59.11% <87.50%> (+1.75%)	⬆️
packages/cbl/lib/src/query/ffi_query.dart	59.68% <100.00%> (+2.09%)	⬆️
packages/cbl_ffi/lib/src/query.dart	84.74% <100.00%> (ø)

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