Add faster Laplace

[rohanbabbar04]

Description

• Add class Laplace with all methods.
• Update test in test_scipy.py.

Checklist

• Code style is correct (follows pylint and black guidelines)
• Includes new or updated tests to cover the new feature
• New features are properly documented (with an example if required)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 82.55814% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 82.75%. Comparing base (c521038) to head (40acba7).

Files	Patch %	Lines
preliz/distributions/laplace.py	82.35%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #356      +/-   ##
==========================================
- Coverage   82.83%   82.75%   -0.09%     
==========================================
  Files          51       52       +1     
  Lines        5099     5154      +55     
==========================================
+ Hits         4224     4265      +41     
- Misses        875      889      +14     

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