Implement investment limits

[tsmbland]

Description

TODO: add tests

Fixes #1069

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
• Update release notes for the latest release if this PR adds a new feature or fixes a bug
  present in the previous release

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.26%. Comparing base (195c94c) to head (6c28f0f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1096      +/-   ##
==========================================
+ Coverage   85.14%   85.26%   +0.11%     
==========================================
  Files          55       55              
  Lines        7559     7599      +40     
  Branches     7559     7599      +40     
==========================================
+ Hits         6436     6479      +43     
+ Misses        816      813       -3     
  Partials      307      307              

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