Perturbation Sampling for PSF

[Marvin-Beckmann]

Description

This PR implements will add perturbation sampling for presampling. This makes it possible to more efficiently sample generate signatures.

• Fix length of signatures generated using presampling (reason yet to be determined)
• Finish documentation and test

Testing

• I added basic working examples (possibly in doc-comment)
• I triggered all possible errors in my test in every possible way
• I included tests for all reasonable edge cases
• I provided an intuition regarding how certain inputs have to be set
• Add a benchmark with large parameters close to proposed parameters in papers

Checklist:

• I have performed a self-review of my own code
  • The code provides good readability and maintainability s.t. it fulfills best practices like talking code, modularity, ...
    • The chosen implementation is not more complex than it has to be
  • My code should work as intended and no side effects occur (e.g. memory leaks)
  • The doc comments fit our style guide
  • I have credited related sources if needed