Move ConfigurableMetricExporterProvider to autoconfigure-spi (#4478)

docs/apidiffs/current_vs_latest/opentelemetry-sdk-extension-autoconfigure-spi.txt

@@ -1,2 +1,6 @@
 Comparing source compatibility of  against 
-No changes.
++++  NEW INTERFACE: PUBLIC(+) ABSTRACT(+) io.opentelemetry.sdk.autoconfigure.spi.metrics.ConfigurableMetricExporterProvider  (not serializable)
+	+++  CLASS FILE FORMAT VERSION: 52.0 <- n.a.
+	+++  NEW SUPERCLASS: java.lang.Object
+	+++  NEW METHOD: PUBLIC(+) ABSTRACT(+) io.opentelemetry.sdk.metrics.export.MetricExporter createExporter(io.opentelemetry.sdk.autoconfigure.spi.ConfigProperties)
+	+++  NEW METHOD: PUBLIC(+) ABSTRACT(+) java.lang.String getName()

docs/apidiffs/current_vs_latest/opentelemetry-sdk-testing.txt

@@ -1,4 +1,7 @@
 Comparing source compatibility of  against 
+***  MODIFIED CLASS: PUBLIC io.opentelemetry.sdk.testing.exporter.InMemoryMetricReader  (not serializable)
+	===  CLASS FILE FORMAT VERSION: 52.0 <- 52.0
+	+++  NEW METHOD: PUBLIC(+) java.lang.String toString()
 ***  MODIFIED CLASS: PUBLIC FINAL io.opentelemetry.sdk.testing.junit4.OpenTelemetryRule  (not serializable)
 	===  CLASS FILE FORMAT VERSION: 52.0 <- 52.0
 	+++  NEW METHOD: PUBLIC(+) void clearMetrics()