Add eyelid data hadling and example on aperture

[mikelgg93]

This PR adds support for eyelid parameters, it reads them from the eye_state file, and adds them as a separate stream for clarity.

• Raise an error if the eyelid stream is invoked but there is no eyelid data.

pl-neon-recording/src/pupil_labs/neon_recording/stream/eyelid_stream.py

Line 31 in 2a8b3c2

raise ValueError("This recording does not contain eyelid data.")

• Read only eye state parameters on the eye state stream.

pl-neon-recording/src/pupil_labs/neon_recording/stream/eye_state_stream.py

Line 44 in 2a8b3c2

data = np.vstack([time_data, data.T[:14]])

Includes an example plotting the eyelid aperture in mm for both eyes over the eyes.