implement jack's suggestion of moving the ExtendedTextMapGetter from context.internal.propagation package into context.propagation.internal package

Author: jamesmoessis

api/all/src/main/java/io/opentelemetry/api/baggage/propagation/W3CBaggagePropagator.java

@@ -13,10 +13,10 @@
 import io.opentelemetry.api.internal.PercentEscaper;
 import io.opentelemetry.api.internal.StringUtils;
 import io.opentelemetry.context.Context;
-import io.opentelemetry.context.internal.propagation.ExtendedTextMapGetter;
 import io.opentelemetry.context.propagation.TextMapGetter;
 import io.opentelemetry.context.propagation.TextMapPropagator;
 import io.opentelemetry.context.propagation.TextMapSetter;
+import io.opentelemetry.context.propagation.internal.ExtendedTextMapGetter;
 import java.util.Collection;
 import java.util.Iterator;
 import java.util.List;

api/all/src/test/java/io/opentelemetry/api/baggage/propagation/W3CBaggagePropagatorTest.java

@@ -13,8 +13,8 @@
 import io.opentelemetry.api.baggage.Baggage;
 import io.opentelemetry.api.baggage.BaggageEntryMetadata;
 import io.opentelemetry.context.Context;
-import io.opentelemetry.context.internal.propagation.ExtendedTextMapGetter;
 import io.opentelemetry.context.propagation.TextMapGetter;
+import io.opentelemetry.context.propagation.internal.ExtendedTextMapGetter;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Iterator;

context/src/main/java/io/opentelemetry/context/internal/propagation/ExtendedTextMapGetter.java renamed to context/src/main/java/io/opentelemetry/context/propagation/internal/ExtendedTextMapGetter.java

@@ -3,7 +3,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-package io.opentelemetry.context.internal.propagation;
+package io.opentelemetry.context.propagation.internal;
 
 import io.opentelemetry.context.propagation.TextMapGetter;
 import java.util.Collections;