[RTM] added multi-node penalties to objective plots

[EveCharbie]

All Submissions:

• Have you followed the guidelines in our Contributing document [docs/contribution.md]?
• Have you checked to ensure there aren't other open [Pull Requests] for the same update/change?
• Have you opened/linked the issue related to your pull request? Issue add multinode penalties to add_plot_penalty #725
• Have you used the tag [WIP] for on-going changes, and removed it when the pull request was ready?
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New Feature Submissions:

1. Does your submission pass the tests (if not please explain why this is intended)?
2. Did you write a proper documentation (docstrings and ReadMe)
3. Have you linted your code locally prior to submission (using the command: black . -l120 --exclude "external/*")?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new examples for your core changes, as applicable?
• Have you written new tests for your core changes, as applicable?

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This change is 

[pariterre]

Reviewed 3 of 3 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @EveCharbie)

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bioptim/examples/getting_started/example_multinode_objective.py line 120 at r1 (raw file):

    n_shooting = 30
    ocp = prepare_ocp(biorbd_model_path="models/pendulum.bioMod", final_time=1, n_shooting=n_shooting)
    # ocp.add_plot_penalty(CostType.ALL)

Can be uncomment

[EveCharbie]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @pariterre)

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bioptim/examples/getting_started/example_multinode_objective.py line 120 at r1 (raw file):

Previously, pariterre (Pariterre) wrote…

Can be uncomment

Done.

[codecov]

Codecov Report

Patch coverage: 39.58% and project coverage change: -0.10 ⚠️

Comparison is base (04720af) 81.77% compared to head (0fc3e0c) 81.67%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #726      +/-   ##
==========================================
- Coverage   81.77%   81.67%   -0.10%     
==========================================
  Files         130      130              
  Lines       15804    15846      +42     
==========================================
+ Hits        12923    12942      +19     
- Misses       2881     2904      +23     

Impacted Files	Coverage Δ
...les/getting_started/example_multinode_objective.py	82.35% <0.00%> (-2.50%)	⬇️
bioptim/optimization/optimal_control_program.py	86.20% <28.57%> (-1.01%)	⬇️
bioptim/gui/plot.py	70.65% <46.87%> (-0.89%)	⬇️

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[EveCharbie]

@pariterre I think we are good to go :)