Replace crate prometheus with prometheus-client

[MrCroxx]

RisingWave initially chose the crate prometheusas the client for Prometheus because of its convenience. However, as the system became more complex, the flexibility of crate prometheus brought a lot of burden to the maintenance of metrics.

• feat(batch): improve the implementation of BatchTaskMetrics #5770
• fix(batch): remove task metrics after task finishes and ensure metrics are collected #9171
• fix(metrics): clean streaming actor metrics after dropped (p1) #9756
• feat(log-store): add metrics for log store #12653
• feat(metrics): support reference counting in metrics label #12882
• feat(metrics): remove metrics labels after being collected #13080

Besides, prometheus is not actively maintained now.

tikv/rust-prometheus#490

Now, prometheus has its official rust client crate prometheus-client, which gives less flexibility but makes it easier to maintain. It's time to explore the official crate and replace prometheus with prometheus-client.

[github-actions]

This issue has been open for 60 days with no activity. Could you please update the status? Feel free to continue discussion or close as not planned.