[Metrics] Implement Metric filters

[bryce-b]

https://opentelemetry.io/docs/specs/otel/metrics/sdk/#metricfilter

Note: this shouldn't block stable metrics release

[amirmohsen-am]

@bryce-b we’re considering using OpenTelemetry metrics in our swift code. Do you guys have a target release timeline in mind?

[bryce-b]

Hi @amirmohsen-am Are you asking about Metrics support as a whole, which is available in the SDK now, or metric filters specifically?