FIX: moved fpdf2 and rpyc in optional dependencies

[maxcapodi78]

Description

fpdf2 and rpyc are two packages that are used only in a specific class of pyaedt.
Moved them to optional

Issue linked

Please mention the issue number or describe the problem this pull request addresses.

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

[SMoraisAnsys]

LGTM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.34%. Comparing base (92ca3f8) to head (ebce376).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6647   +/-   ##
=======================================
  Coverage   82.34%   82.34%           
=======================================
  Files         242      242           
  Lines       76995    76995           
=======================================
+ Hits        63402    63404    +2     
+ Misses      13593    13591    -2     

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