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replace exometer/exometer_core with prometheus.erl

This commit replaces exometer/exometer_core libraries with prometheus.erl
to collect RADIUS metrics.

All metrics names are preserved as it was before. Only internal structure
of metrics names changed as exometer stored metrics names as list of atoms,
but prometheus stores metrics names as binary strings.

The one backward compatibility change is - prometheus histogram observations
are stored into buckets, but exometer histograms collected data and
calculated quantiles. Now calculation of quantiles should be
done on prometheus site via prometheus functions.

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