* add custom monitor prometheus as a baseline to build functionality
* working server, set up function to update metrics in the registry
* for a test
* metrics for corpus count, objective count, executions, execution rate are intermittently updated and exposed on /metrics
* add runtime metric, clean up some comments
* IP:PORT as argument instead of hardcoded
* add client # as label attached to fuzzer metrics for filtering by client. add clients_count as a tracked metric
* added support for custom metrics added to client_stats via feedbacks, such as edges count. cleaned up code
* cargo fmt
* clean up prometheus.rs
* ran autofix and fmt scripts, and put optional dependencies behind prometheus_monitor feature
Co-authored-by: Dominik Maier <domenukk@gmail.com>
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