Introduce modular install of event cameras

[Jegp]

Inivation and Prophesee cameras require binary drivers. Ideally, we would add them with extras_require such that users can decide whether they want the extra dependency with pip install aestream[vendor], where vendor could be Inivation/Prophesee.

Currently, the drivers for inivation is automatically detected in the Cmake file, meaning that the user has to manually install them.