Update HostAndRequestAsHttpUriRequest for Apaches

Author: sarahchen6

dd-java-agent/instrumentation/apache-httpasyncclient-4/src/main/java/datadog/trace/instrumentation/apachehttpasyncclient/HostAndRequestAsHttpUriRequest.java

@@ -72,6 +72,11 @@ public Header getFirstHeader(String name) {
     return actualRequest.getFirstHeader(name);
   }
 
+  @Override
+  public Header[] getHeaders(String name) {
+    return actualRequest.getHeaders(name);
+  }
+
   public HttpRequest getActualRequest() {
     return actualRequest;
   }

dd-java-agent/instrumentation/apache-httpclient-4/src/main/java/datadog/trace/instrumentation/apachehttpclient/HostAndRequestAsHttpUriRequest.java

@@ -68,6 +68,11 @@ public Header getFirstHeader(String name) {
     return actualRequest.getFirstHeader(name);
   }
 
+  @Override
+  public Header[] getHeaders(String name) {
+    return actualRequest.getHeaders(name);
+  }
+
   public HttpRequest getActualRequest() {
     return actualRequest;
   }

dd-java-agent/instrumentation/apache-httpclient-5/src/main/java/datadog/trace/instrumentation/apachehttpclient5/HostAndRequestAsHttpUriRequest.java

@@ -39,4 +39,9 @@ public void setHeader(String name, Object value) {
   public Header getFirstHeader(String name) {
     return actualRequest.getFirstHeader(name);
   }
+
+  @Override
+  public Header[] getHeaders(String name) {
+    return actualRequest.getHeaders(name);
+  }
 }