load gaze files with gaze.from_edf()

[dkrako]

Description of the problem

Followup to #508 where it would be even nice to not have to convert from edf to asc manually.

Description of a solution

Function signature proposal:

def from_edf(
    path: str | Path,
    asc_path: str | Path | None = None,
    retain_asc: bool = False,
    edf2asc_path: str | Path | None,
) -> GazeDataFrame:

In the function edf2asc from SR research would need to be called and an asc file will be created at the asc_path.

• If no asc_path is given, the same directory as the input file is chosen with the same file stem but with an .asc extension.
• In case the edf2asc_path is not specified, the place should be automatically inferred from default places.
• If no edf2asc can be found, a helpful error message with a link to the sr research forum should be printed.
• The created asc-file can be retained by passing retain_asc=True. We should discuss what the default should be.