Provide E2VID conversion capability for files

[AdamDHines]

Is your feature request related to a problem? Please describe.
Event to video reconstruction is a common method used from event streams. Popular libraries like E2VID require specific file formats to be used, where conversion can be cumbersome.

Describe the solution you'd like
Use the native EventReader object to provide a fast conversion to E2VID formats, or explore native support/direct conversion in EventCV.

[AdamDHines]

Potentially worth exploring the idea to fork E2VID repository and modernise it, would be able to handle EventReader objects directly.