Add type dispatching to pybind11 extension of dpnp.linalg.eigh()

[antonwolfy]

The PR adds a type matrix towards LAPACK pybind11 extension and defines supported type of heevnd and syevd functions by OneMKL.
The existing extensions are updated to call dispatching function depending on type of input arrays.

Additionally the channels are explicitly defined for installing dependent packages of dpnp in generate coverage and build sphinx github actions to prevent unpredictable behavior with defaults channel used by conda-incubator/setup-miniconda (no option provided by the action to override the default channel).

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[vlad-perevezentsev]

LGTM
Thanks @antonwolfy !