Refactor continuous aggregate materialization code

[fabriziomello]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 89.58333% with 15 lines in your changes missing coverage. Please review.

Project coverage is 82.19%. Comparing base (59f50f2) to head (002c1d0).
Report is 628 commits behind head on main.

Files with missing lines	Patch %	Lines
tsl/src/continuous_aggs/materialize.c	89.58%	9 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7505      +/-   ##
==========================================
+ Coverage   80.06%   82.19%   +2.12%     
==========================================
  Files         190      230      +40     
  Lines       37181    43222    +6041     
  Branches     9450    10870    +1420     
==========================================
+ Hits        29770    35526    +5756     
- Misses       2997     3373     +376     
+ Partials     4414     4323      -91     

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