feat: metrics for counting state of cas requests

[samika98]

Description

We need metrics for keeping track of how many streams have been anchored/errored or are in pending state. This is done in order to track performance of anchoring.

How Has This Been Tested?

Tested locally by creating a ceramic node with config where prometheus exporter was turned on.

• [x] Created streams and checked if the metrics were being reported accurately on url http://localhost:9464/metrics : Result : # HELP js_ceramic_cas_request_success_total description missing

  TYPE js_ceramic_cas_request_success_total counter

  js_ceramic_cas_request_success_total 7513

PR checklist

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• [Yes ] I have tagged the relevant reviewers and interested parties
• [ Not needed] I have updated the READMEs of affected packages
• [Not needed ] I have made corresponding changes to the documentation

References:

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[linear[bot]]

WS2-3140 Keramik Scenario CAS performance test

[samika98]

If a stream gets polled multiple times then these counts can be off, in the case where we want expect only one state for a stream. Number of requests = Number of streams created Number of streams created != cas_request_failed + cas_request_success + cas_request_pending.

In the case where everything happens at 300 tps we should get Number of streams created = cas_request_success.