Overhaul PyDesigner Code 2

[TheJaeger]

This PR fixes various reported bugs and updates documentation to tackle:

• [ ] #305
• [ ] #303
• [ ] #306
• [x] #301
• [ ] #308
• [x] Transition to Poetry
• [x] Add type hints
• [x] Overhaul docstring
• [x] Introduce pre-commit hooks
• [ ] Add pytests
• [ ] Remove redundant classes and functions

In addition, PyDesigner will undergo transition to Poetry for package management and pre-commit for hooks and tests. Automations will also be introduced to automatically publish, release, and document changes.

Another big change is to transition PyDesigner into a diffusion imaging library i.e. various functions of PyDesigner can be called for custom scripting.

[github-actions[bot]]

Test Results

128 tests   128 :white_check_mark:  20s :stopwatch:   1 suites    0 :zzz:   1 files      0 :x:

Results for commit 973f66ca.

:recycle: This comment has been updated with latest results.

[github-actions[bot]]

Package	Line Rate	Health
.	0%	❌
fitting	40%	➖
plotting	3%	❌
postprocessing	0%	❌
preprocessing	23%	➖
system	85%	✔
tractography	16%	➖
Summary	25% (923 / 3755)	➖

Minimum allowed line rate is 10%