Where clause optimisation for OR operator

[robacourt]

Summary

• optimise OR in the sync-service filter tree
• split OR branches only when both sides are indexable, otherwise keep the shape once in other_shapes
• add coverage for OR behaviour, OR cleanup, OR+subquery routing, and raw OR performance
• remove IN special case as it's now covered by the OR optimisation

Testing

• mix test test/electric/shapes/filter_test.exs
• mix test test/electric/shape_cache/shape_status_test.exs

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.24%. Comparing base (801d714) to head (6756d37).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@                        Coverage Diff                         @@
##           rob/simple-subqueries-with-dnf    #4134      +/-   ##
==================================================================
+ Coverage                           86.29%   89.24%   +2.95%     
==================================================================
  Files                                  51       25      -26     
  Lines                                3553     2520    -1033     
  Branches                              638      635       -3     
==================================================================
- Hits                                 3066     2249     -817     
+ Misses                                485      269     -216     
  Partials                                2        2              

Flag	Coverage Δ
elixir	?
elixir-client	?
packages/experimental	87.73% <ø> (ø)
packages/react-hooks	86.48% <ø> (ø)
packages/start	82.83% <ø> (ø)
packages/typescript-client	94.36% <ø> (+0.05%)	⬆️
packages/y-electric	56.05% <ø> (ø)
typescript	89.24% <ø> (+0.03%)	⬆️
unit-tests	89.24% <ø> (+2.95%)	⬆️

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