Update opentelemetry.io cookbook with common view scenarios

https://opentelemetry.io/docs/instrumentation/python/cookbook/

Some possible common scenarios:
- turn off a metric
- turn off all metrics from a given instrumentation
- turn default views off and require explicitly turning individual instruments "on" ([basically this](https://opentelemetry-python.readthedocs.io/en/latest/sdk/metrics.html#id1))