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add in-place `mt_pgram!`, and multitaper spectrogram, multitaper csd, multitaper coherence  (#401)

* Initial multitaper spectrogram code ported from a private Beacon repo

Co-authored-by: Alex Arslan <ararslan@comcast.net>
Co-authored-by: Kalyan Palepu <KalyanPalepu@users.noreply.github.com>
Co-authored-by: kolia <kolia.sadeghi@beacon.bio>

* fix size of `tmp`, rename fields, return spectrogram object

* format

* port WIP coherence and cross spectral code

Co-authored-by: Alex Arslan <ararslan@comcast.net>
Co-authored-by: Kalyan Palepu <KalyanPalepu@users.noreply.github.com>
Co-authored-by: kolia <kolia.sadeghi@beacon.bio>

wip

wip

wip

wip

add WIP cross-spectra code so I don't lose it

Co-authored-by: Alex Arslan <ararslan@comcast.net>
Co-authored-by: Kalyan Palepu <KalyanPalepu@users.noreply.github.com>
Co-authored-by: kolia <kolia.sadeghi@beacon.bio>

fix bug, change syntax for 1.0

format

wip

wip

wip

fix

Rename `sample_rate` -> `fs`

fixes

* transfer tests

Co-authored-by: Alex Arslan <ararslan@comcast.net>
Co-authored-by: Kalyan Palepu <KalyanPalepu@users.noreply.github.com>
Co-authored-by: kolia <kolia.sadeghi@beacon.bio>

* add some MATLAB reference tests

Co-authored-by: mich11 <michelle.fogerson@gmail.com>

swap order to match Onda

wip

align better with existing api

fix test

Fix MATLAB reference test

Co-authored-by: mich11 <michelle.fogerson@gmail.com>

* fix csd bugs, add tests

fix bugs

rename

add coherence reference test

* remove `d`s since these aren't normalized as densities

* whoops, rm extraneous file

* fix typo

* infer `MTSpectrogramConfig` eltype from `MTConfig` eltype

* rm `n_freq_bins`, `n_time_points`, add some checks to the MTSpectrogramConfig constructor

* try to fix bugs...

* fix find-and-replace bug

* reformat

* test magically works now (?)

* handle `n_samples < samples_per_window`

* tweak `coherence_fro... (continued)

188 of 188 new or added lines in 2 files covered. (100.0%)

1674 of 1713 relevant lines covered (97.72%)

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