Reduce dependencies

[ryanharvey1]

Let's reduce the number of dependencies.

For the following, we can have optional dependencies or lazy imports as these are only used for CSD

    "elephant>=1.1.0",
    "neo>=0.13.3",
    "quantities>=0.15.0",

For these, we can reproduce using numpy

    "neurodsp>=2.2.1",
    "pyFFTW>=0.13.1",

For this, we can reproduce the two methods we are using

https://github.com/ryanharvey1/neuro_py/blob/b7024752086b701cbc4bd1d59ee51a3664478374/neuro_py/behavior/linearization_pipeline.py#L11C29-L11C74

"track-linearization>=2.3.1",