Virtual pi network

[hibenj]

Description

This PR includes the virtual_pi_network.hpp, virtual_pi_network.cpp(testing) and virtual_pi_network.rst(documentation), as well as the necessary changes in traits.hpp
The virtual PI network enhances all mockturtle network types to store duplicates of their PIs, called virtual PIs.

Checklist:

• The pull request only contains commits that are related to it.
• I have added appropriate tests and documentation.
• I have added a changelog entry.
• I have created/adjusted the Python bindings for any new or updated functionality.
• I have made sure that all CI jobs on GitHub pass.
• The pull request introduces no new warnings and follows the project's style guidelines.

[codecov]

Codecov Report

Attention: Patch coverage is 90.44586% with 30 lines in your changes missing coverage. Please review.

Project coverage is 98.10%. Comparing base (2e24360) to head (ba87098).

Files with missing lines	Patch %	Lines
test/networks/virtual_pi_network.cpp	91.83%	16 Missing ⚠️
include/fiction/networks/virtual_pi_network.hpp	88.13%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #543      +/-   ##
==========================================
- Coverage   98.18%   98.10%   -0.08%     
==========================================
  Files         226      228       +2     
  Lines       31765    32083     +318     
  Branches     1580     1601      +21     
==========================================
+ Hits        31187    31475     +288     
- Misses        578      608      +30     

Files with missing lines	Coverage Δ
include/fiction/networks/virtual_pi_network.hpp	88.13% <88.13%> (ø)
test/networks/virtual_pi_network.cpp	91.83% <91.83%> (ø)

... and 3 files with indirect coverage changes

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[github-actions]

clang-tidy made some suggestions

[github-actions]

clang-tidy made some suggestions

[github-actions]

clang-tidy made some suggestions

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"