GitLab

* add kaldi fbank

* make style

* add herz_to_mel_kaldi tests

* add mel to hertz kaldi test

* integration tests

* correct test and remove comment

* make style

* Apply suggestions from code review
Co-authored-by: Sanchit Gandhi <93869735+sanchit-gandhi@users.noreply.github.com>

* change parameter name

* Apply suggestions from Arthur review
Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>

* Update remove_dc_offset description

* fix bug  + make style

* fix error in using np.exp instead of np.power

* make style

---------
Co-authored-by: Sanchit Gandhi <93869735+sanchit-gandhi@users.noreply.github.com>
Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>