Add AVR ST6B

[SebastianManriqueM]

Required for Honduras Project

[github-actions]

Performance Results

Version	Precompile Time
Main	2.058988286
This Branch	2.059540413

Version	Execute Time
Main-Build ResidualModel	7.962067824
Main-Execute ResidualModel	17.3640975
Main-Build MassMatrixModel	0.636106571
Main-Execute MassMatrixModel	32.369111027
This Branch-Build ResidualModel	7.196132405
This Branch-Execute ResidualModel	17.233314801
This Branch-Build MassMatrixModel	0.666423837
This Branch-Execute MassMatrixModel	33.028937306

ResidualModel and MassMatrixModel performance results should be compared between versions and not between models due to the execution order of the tests

[codecov]

Codecov Report

Attention: Patch coverage is 96.77419% with 4 lines in your changes missing coverage. Please review.

Project coverage is 86.80%. Comparing base (c94d006) to head (acc55d6).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
...rc/initialization/generator_components/init_avr.jl	90.47%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #388      +/-   ##
==========================================
- Coverage   87.36%   86.80%   -0.57%     
==========================================
  Files          65       66       +1     
  Lines        9143     9561     +418     
==========================================
+ Hits         7988     8299     +311     
- Misses       1155     1262     +107     

Flag	Coverage Δ
unittests	86.80% <96.77%> (-0.57%)	⬇️

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

Files with missing lines	Coverage Δ
src/models/generator_models/avr_models.jl	99.20% <100.00%> (+0.11%)	⬆️
src/post_processing/post_proc_generator.jl	90.28% <100.00%> (+1.13%)	⬆️
...rc/initialization/generator_components/init_avr.jl	94.91% <90.47%> (-0.57%)	⬇️

... and 5 files with indirect coverage changes