Extend `Prometheus::Client.reinitialize_on_pid_change` method

Aleksei Lipniagovrequested to merge
alipniagov-add-reinitialize-method into master

Extend Prometheus::Client.reinitialize_on_pid_change method to receive :force param.

With force: true it reinitializes all metrics files.
With force: false (default) it reinitializes only on changed PID (as it was before).
In any case, it keeps the registry (as it was before).

Thus, the change is backward compatible.

Edited by 🤖 GitLab Bot 🤖

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