Adding more option to enable required mongo stats to monitor

[Nitesh-vaidyanath]

Request

Currently there's is not way to enable or disable mongo metrics which we are interested in, by default CollectAll is set to true. This feature request to expose variables to agent integration to enable or disable stats which we are interested in.

I have made some changes to add this feature, by default exporter will monitor for all mongo stats until we set required stats to true.

Use case

We have a use case to monitor only health of replica set every 15 seconds but we are not interested in db or Coll or index stats for every 15 seconds.

[Nitesh-vaidyanath]

grafana/agent#6021 PR

[github-actions]

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