feat(sync-service): Send individual operations to ShapeLogCollector

[robacourt]

Part of #3414, this PR sends individual operations from the ReplicationClient to ShapeLogCollector. This should reduce the working memory used by the ReplicationClient, but the ultimate aim is to send individual operations to storage and so not buffer at any point (unless subqueries are involved). This PR just moves the transaction consolidation one step, from ReplicationClient to ShapeLogCollector to keep the PR small. Other PRs will move the consolidation further, from ShapeLogCollector to Consumer, then finally from to Consumer to storage (except with subqueries are involved).

Currently the replication stream take two forms:

1. Replication.Messages such as Messages.Begin, Messages.Commit, Messages.Insert etc.
2. Changes.Transaction (or Changes.Relation)

And Collector converts one to the other.

This PR introduces an intermediate form, Operations, as Messages are coupled to the postgres replication protocol and are not optimised for use with Shapes (for example they do not include the relation name) and Transactions are whole transactions. So with this PR we have:

1. Replication.Messages such as Messages.Begin, Messages.Commit, Messages.Insert etc.
2. Operation (spec: Changes.operation()) such as Changes.Begin. Changes.Commit, Changes.NewRecord etc.
3. Changes.Transaction (or Changes.Relation) which I'm calling database actions (spec: Changes.action())

Collector has been replaced by MessageConverter that converts 1 to 2 and TransactionBuilder that coverts 2 to 3.

[codecov]

Codecov Report

❌ Patch coverage is 97.46835% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.39%. Comparing base (c4d0ea4) to head (406bd73).

Files with missing lines	Patch %	Lines
...c/postgres/replication_client/message_converter.ex	95.55%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3429      +/-   ##
==========================================
- Coverage   69.54%   69.39%   -0.16%     
==========================================
  Files         182      183       +1     
  Lines        9778     9752      -26     
  Branches      353      353              
==========================================
- Hits         6800     6767      -33     
- Misses       2976     2983       +7     
  Partials        2        2              

Flag	Coverage Δ
elixir	66.33% <97.46%> (-0.19%)	⬇️
elixir-client	73.94% <ø> (-0.53%)	⬇️
packages/experimental	87.73% <ø> (ø)
packages/react-hooks	86.48% <ø> (ø)
packages/typescript-client	93.81% <ø> (ø)
packages/y-electric	55.12% <ø> (ø)
postgres-140000	65.38% <97.46%> (-0.10%)	⬇️
postgres-150000	?
postgres-170000	65.36% <97.46%> (-0.27%)	⬇️
postgres-180000	65.41% <97.46%> (?)
sync-service	65.57% <97.46%> (-0.16%)	⬇️
typescript	87.19% <ø> (ø)
unit-tests	69.39% <97.46%> (-0.16%)	⬇️

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