Implement loops v2

[tsmbland]

Description

Fixes #794

Type of change

• Bug fix (non-breaking change to fix an issue)
• New feature (non-breaking change to add functionality)
• Refactoring (non-breaking, non-functional change to improve maintainability)
• Optimization (non-breaking change to speed up the code)
• Breaking change (whatever its nature)
• Documentation (improve or add documentation)

Key checklist

• All tests pass: $ cargo test
• The documentation builds and looks OK: $ cargo doc

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

❌ Patch coverage is 36.38889% with 229 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.28%. Comparing base (c64a7a8) to head (228bd43).
⚠️ Report is 11 commits behind head on flexible_capacity_assets.

Files with missing lines	Patch %	Lines
src/simulation/investment.rs	6.50%	114 Missing and 1 partial ⚠️
src/simulation/optimisation.rs	44.44%	82 Missing and 8 partials ⚠️
src/simulation/optimisation/constraints.rs	59.09%	16 Missing and 2 partials ⚠️
src/output.rs	85.18%	1 Missing and 3 partials ⚠️
src/asset.rs	33.33%	2 Missing ⚠️

Additional details and impacted files

@@                     Coverage Diff                      @@
##           flexible_capacity_assets     #986      +/-   ##
============================================================
- Coverage                     83.94%   81.28%   -2.67%     
============================================================
  Files                            52       52              
  Lines                          5794     6033     +239     
  Branches                       5794     6033     +239     
============================================================
+ Hits                           4864     4904      +40     
- Misses                          695      883     +188     
- Partials                        235      246      +11     

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