Add investment method to the graph structure

[datejada]

Pull request details

Describe the changes made in this pull request

Add the investment method to the graph structure to differentiate the investment method to use it in the model. Currently, the parameter is read, but it is not available in the graph.

List of related issues or pull requests

Closes #787

Collaboration confirmation

As a contributor I confirm

• I read and followed the instructions in README.dev.md
• The documentation is up to date with the changes introduced in this Pull Request (or NA)
• Tests are passing
• Lint is passing

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (a40c96b) to head (f342e73).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #788   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           18        18           
  Lines          904       904           
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  Hits           904       904           

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[datejada]

@abelsiqueira For the changes @gnawin and I are working on, we both need this change. That is why I have created a separate issue so we can both pull the latest changes from the main branch.

And...to follow the atomic commit principles, master! 🧙