Adding user defined random generator

[maxime-bruno]

Adds an option for the user to build NormalizedBw, SawtoothBw, NormalizedDelayPerPacket, and LogNormalizedDelayPerPacket with a custom random generator.

Description

StdRng which is the currently used random generator is not portable, meaning that on different architectures, or in the future, the randomly generated sequence could be different

I kept the default behavior, using StdRng, but added functions ending by _with_rng (build_with_rng for all and build_truncated_with_rng for normal laws) that let the user choose the random generator.

I modified the following types by making them parameterized (with StdRng as the default type):

• NormalizedBw became NormalizedBw<Rng = StdRng>
• SawtoothBw
• NormalizedDelayPerPacket
• LogNormalizedDelayPerPacket

I added the functions:

• build_with_rng<Rng: RngCore + SeedableRng>(self) -> Self<Rng> for :
  • NormalizedBw
  • SawtoothBw
  • NormalizedDelayPerPacket
  • LogNormalizedDelayPerPacket
• build_truncated_with_rng<Rng: RngCore + SeedableRng(mut self) -> Self<Rng> for:
  • NormalizedBw
  • NormalizedDelayPerPacket

I also added some documentation for the config of the models.

How Has This Been Tested

I tested (on Ubuntu 24.04) using the unit test and doc test included (I added several doc tests), and I'm open to adding additional ones.

Types of changes

• New feature (non-breaking change which adds functionality)
• Documentation (non-breaking change which updates documentation)

Checklist

• Code follows the code style of this project.
• Changes follow the CONTRIBUTING guidelines.
• Update necessary documentation accordingly.
• Lint and tests pass locally with the changes.
• Check issues and pull requests first. You don't want to duplicate effort.

[BobAnkh]

LGTM