61 create pseudorandom number generator factory service

[ndouglas]

Summary

Closes #60. Closes #61.

Definition of Done

• [x] Code is:
  • [x] written in idiomatic Rust
  • [x] commented where necessary
  • [x] documented where beneficial
  • [x] follows the project's coding standards, and
  • [x] is efficiently structured for maintenance and scalability.
• [ ] Changes are benchmarked to ensure they do not degrade performance.
• [x] Comprehensive unit tests cover new functionality and changes.
• [ ] Integration tests cover features with user stories where possible.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.65625% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 96.58%. Comparing base (57d27a2) to head (caf8edc).

Files	Patch %	Lines
src/prng/registry.rs	96.15%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #64 +/- ## ========================================== + Coverage 96.16% 96.58% +0.41% ========================================== Files 13 15 +2 Lines 287 410 +123 ========================================== + Hits 276 396 +120 - Misses 11 14 +3 ```

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