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Add helper to provide Puma worker PIDs

Esteban Trejos Quiros requested to merge etrejosq/prometheus-client-mmap:add-puma-worker-pid-provider into master

This is an adaptation of the Prometheus::Client::Support::Unicorn module but for Puma.

It works in the same way, first tries to obtain the worker index by matching the $PROGRAM_NAME with a RegExp and extracting the index match, if that fails, it obtains the index by obtaining an instance of Puma::Cluster::Worker using ObjectSpace and reading the index from the instance, if that fails, it uses the process PID.

Puma ran on clustered mode will return a worker_id_{index} value, on single mode, it will return a process_id_{pid} value.

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