Support delta temporality in otel metrics export

[alvarosevilla95]

What is the problem this feature would solve?

Some platforms, such as Datadog, expect / work better when metrics are exported using delta temporality aggregation, but currently it looks like effect metrics are hardcoded to use cummulative aggregation.

What is the feature you are proposing to solve the problem?

I'm admittedly not very familiar with otel metrics, just noticed that metrics seem to behave a bit weird when exported to datadog, but the metrics code would need to respect the temporalityPreference specified by the user and allow exporting metrics interval deltas, rather than the cumulative value across the runtime of the program

What alternatives have you considered?

No response