Implement ICDF for Laplace and Pareto distributions

[james-2001]

What is this PR about?
Adds ICDF functions to Laplace and Pareto distributions.

References:

• https://en.wikipedia.org/wiki/Pareto_distribution
• https://en.wikipedia.org/wiki/Laplace_distribution

Issue #6612

Checklist

• Explain important implementation details 👆
• Make sure that the pre-commit linting/style checks pass.
• Link relevant issues (preferably in nice commit messages)
• Are the changes covered by tests and docstrings?
• Fill out the short summary sections 👇

Major / Breaking Changes

New features

Pareto.icdf and Laplace.icdf functions

Bugfixes

Documentation

Maintenance

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📚 Documentation preview 📚: https://pymc--6707.org.readthedocs.build/en/6707/

[welcome]

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[codecov]

Codecov Report

Merging #6707 (9abe6fb) into main (371472d) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6707   +/-   ##
=======================================
  Coverage   92.00%   92.01%           
=======================================
  Files          95       95           
  Lines       16125    16139   +14     
=======================================
+ Hits        14836    14850   +14     
  Misses       1289     1289           

Impacted Files	Coverage Δ
pymc/distributions/continuous.py	97.74% <100.00%> (+0.03%)	⬆️

[michaelraczycki]

LGTM, good job!

[welcome]

Congrats on merging your first pull request! 🎉 We here at PyMC are proud of you! 💖 Thank you so much for your contribution 🎁

[ricardoV94]

Thanks @james-2001!