Bifactor Rotation and random starts

[p-gw]

This pull requests implements the bifactor rotation method and adds utiltity to rotate from random starting matrices.

closes #44 closes #46

TODO

• [x] Implement Biquartimin rotation method
• [x] Add a keyword argument to rotate to allow random starts
• [x] Update documentation

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (2bacc2f) 90.50% compared to head (d8f7a9e) 91.30%.

Files	Patch %	Lines
src/rotate.jl	97.95%	1 Missing :warning:
src/utils.jl	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #45 +/- ## ========================================== + Coverage 90.50% 91.30% +0.80% ========================================== Files 22 22 Lines 379 437 +58 ========================================== + Hits 343 399 +56 - Misses 36 38 +2 ```

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