Check for coverage of all metric types

[Aneurysm9]

Some functions and processors that operate on metrics may not correctly operate on all metric types. We have observed at least the resourcetotelemetry helper not accounting for Summary and Exponential Histogram metrics. A survey should be undertaken to check for similar failures.

Is there any linter that we can enable to check this? I know is hard since there is no enum type, but maybe some structure tags can help. This needs to be investigated because I bet there are more places like this.

Originally posted by @bogdandrutu in #7523 (comment)

[mx-psi]

The exhaustive linter from golangci-lint seems to be able to do this: https://github.com/nishanths/exhaustive

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[mattsains]

There are quite a lot of cases where MetricTypeEmpty is not handled by switch statements. eg: https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/processor/attributesprocessor/attributes_metric.go#L73

So we'd need to update all of that code to have a case for Empty / have a default clause but I don't know the code well enough to understand what should be done in those cases.

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[fatsheep9146]

close by #9109