[Feature Request]: Use proxy/middleware pattern to enable/disable metrics for packages

[derrandz]

Implementation ideas

Context

Following a conversation (#1638 (comment)) with @renaynay about the existing pattern (#1638 (comment)) used for metrics in DASer, we would like to implement the instrumentation middleware or proxy pattern to allow easier enabling and disabling of metrics, instead of having to check for nil references when metrics are disabled.

An example of this pattern is available in #1376