Moved inline implementation to src files

[JohanMabille]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 78.26087% with 55 lines in your changes missing coverage. Please review.

Project coverage is 89.67%. Comparing base (ad38206) to head (a0f87e0).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/layout/null_array.cpp	73.07%	21 Missing ⚠️
src/layout/struct_layout/struct_array.cpp	77.21%	18 Missing ⚠️
include/sparrow/layout/union_array.hpp	33.33%	4 Missing ⚠️
src/layout/list_layout/list_value.cpp	0.00%	4 Missing ⚠️
...t/run_end_encoded_layout/run_end_encoded_array.cpp	69.23%	4 Missing ⚠️
src/layout/struct_layout/struct_value.cpp	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #354      +/-   ##
==========================================
- Coverage   90.13%   89.67%   -0.47%     
==========================================
  Files          85       88       +3     
  Lines        6579     6622      +43     
==========================================
+ Hits         5930     5938       +8     
- Misses        649      684      +35     

Flag	Coverage Δ
unittests	89.67% <78.26%> (-0.47%)	⬇️

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