SDK 1.16.0

[!WARNING] This release widened the range of the API peer dependency to include@opentelemetry/api@1.5.x, which introduced an unintentional breaking change. This change was rolled back in https://github.com/open-telemetry/opentelemetry-js/releases/tag/v1.17.0.

:rocket: (Enhancement)

• feat(sdk-metrics): implement MetricProducer specification #4007
• feat: update PeriodicExportingMetricReader and PrometheusExporter to accept optional metric producers #4077 @aabmass

:bug: (Bug Fix)

• fix(exporter-zipkin): rounding duration to the nearest int to be compliant with zipkin protocol #4064 @n0cloud
• fix(sdk-metrics): metric names should be case-insensitive

:books: (Refine Doc)

• docs(guidelines): add dependencies guidelines #4040