Add kinfraglib filters module (skeleton)

[dominiquesydow]

Description

Add a first skeleton for Custom-KinFragLib filters (could also become the home of existing filters, e.g. Ro3, living currently in kinfraglib.utils).

Todos

• [x] Add kinfraglib.filters
• [x] Add kinfraglib.filters.syba skeleton submodule
• [ ] Add kinfraglib.filters.plots skeleton submodule that shall contain generalized plotting function for the different filters
• [ ] change notebooks folder names
• [ ] upload first notebook (e.g. SYBA)

Questions

• [ ] organize notebooks in folder custom_filters_notebooks for my notebooks?
• [ ] rename old kinfraglib notebooks folder to sth like kinfraglib_notebook'?

Status

• [ ] Ready to go