Add prometheus metrics to gettor distributor

meskiorequested to merge
meskio/rdsys:gettor_metrics into main

This commit adds two metrics:

  • gettor_request_total the total number of requests done to gettor, with the command, platform and locale of the original request.
  • gettor_link_response_total the total number of responses with links sent with platform and locale that was used.

Closes: #51 (closed)

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