Refactor to use mne's apply_function

[pmyers16]

Describe the problem

Standardizing the detector functions is very important, so we need a good way of ensuring that a standard is held. This is a down the line nice-to-have.

Describe your solution

We could refactor each of our detectors to work with mne's apply_function
https://mne.tools/stable/generated/mne.io.Raw.html#mne.io.Raw.apply_function
which should do some of the channel processing for us.

Describe possible alternatives

The current method works since we are at least constrained within the sklearn standard. This refactor would be in addition to that.