[View](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#view) provides a configuration API to allow users to config how the data point should be aggregated in SDK. - [ ] Define View API - [ ] Integrate with existing API to aggregate data points using view APIs. - [ ] TBD Related issues: https://github.com/open-telemetry/opentelemetry-rust/issues/673
