Add versioneer script to compute a version number

[antonwolfy]

The PR adds versioneer script to compute a version of dpnp package at build phase.
It also helps to remove all places with hardcoded versions. Thus it will not require anymore to step the versions through the PR per each release.

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[github-actions]

View rendered docs @ https://intelpython.github.io/dpnp/index.html

[vlad-perevezentsev]

These are very useful changes!
LGTM
Many thanks @antonwolfy