feat: Add prometheus metrics.

[bgrozev]

• ref: Move stats config to a separate file.
• ref: Add an abstraction layer in front of statsd.
• ref: Move statsd code under metrics, make private.
• Add a prometheus interface at /metrics.
• feat: Add "healthy" and "recording" metrics.
• ref: Rename a function for clarity.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 6.97674% with 120 lines in your changes are missing coverage. Please review.

Project coverage is 46.34%. Comparing base (081b935) to head (d1a712c). Report is 1 commits behind head on master.

Additional details and impacted files

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