[WIP] add Vector of DateTime for Optimization Results

[rodrigomha]

We need this for Investment where the timestamps are not necessarily the same resolution.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 77.66%. Comparing base (cd78bac) to head (91cda2e).

Files with missing lines	Patch %	Lines
src/Optimization/optimization_problem_results.jl	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #415      +/-   ##
==========================================
- Coverage   77.75%   77.66%   -0.10%     
==========================================
  Files          69       69              
  Lines        5481     5488       +7     
==========================================
  Hits         4262     4262              
- Misses       1219     1226       +7     

Flag	Coverage Δ
unittests	77.66% <0.00%> (-0.10%)	⬇️

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Files with missing lines	Coverage Δ
src/Optimization/optimization_problem_results.jl	0.00% <0.00%> (ø)

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[jd-lara]

We should just make it a vector and include a new constructor

[daniel-thom]

Agree with @jd-lara. We can materialize this into a vector and avoid the union.

[rodrigomha]

This branch will be work in progress for now. I added the case of when there are different time steps for reading results ignoring the timestamps. But will work in a more definitive solution for handling different time stamps for operation, investments and feasibility for SiennaInvestment.