[FEATURE] Monitoring for mubeng

[yudelevi]

Is your feature request related to a problem? Please describe.
In a production environment, I use mubeng for web scraping. There is a need for robust monitoring to ensure the seamless operation of the scraping processes.

Describe the solution you'd like
I propose integrating Prometheus monitoring support into Mubeng to enable comprehensive tracking of key proxy usage and performance metrics. This would involve exposing relevant metrics such as success rates, response times, and error rates to Prometheus.

Describe alternatives you've considered
Alternatively, one could manually implement external monitoring scripts to collect and analyze performance metrics.

[dwisiswant0]

Good idea.