Adding new example : dynamic simulation of PCB

[pmaroneh]

In this PR I am adding a new example of a dynamic simulation (modal and PSD analysis) of a printed circuit board.
This example is inspired from Chapter 20 of the Technology Showcase Example Problems Manual.

[codecov]

Codecov Report

Merging #938 (5842648) into main (d37086d) will not change coverage.
The diff coverage is n/a.

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##             main     #938   +/-   ##
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  Coverage   73.02%   73.02%           
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  Files          39       39           
  Lines        5712     5712           
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  Hits         4171     4171           
  Misses       1541     1541           

[germa89]

Good!

[germa89]

Ask me later.

[pmaroneh]

Codacity check fails because of these:

but this matches what is been done in the files (and also I still get an error if I resolve this, telling me that the docstring should start at the first line...)

[pmaroneh]

Only remaining unsuccessful check is:

Which, as far as I know, I did not modify...

[akaszynski]

I'm fixing the codacy requirements. Minor shouldn't be enforced.

BTW, it's not required for merge, but it is annoying to see those red x's.

[akaszynski]

@pmaroneh, please see the changes made here to make the example more readable:
0ec1211

[akaszynski]

Excellent work all! This is good to merge, example looks great and reads well.

[germa89]

Very nice example @pmaroneh ! Looks great!

Welcome to the team!! :D

Changes made