declarative config: fix stacktrace processor name (#2415)

Author: zeitlinger

span-stacktrace/README.md

@@ -32,7 +32,7 @@ You can enable the stacktrace span processor using declarative YAML configuratio
 file_format: 1.0-rc.1
 tracer_provider:
   processors:
-    - experimental_stacktrace:
+    - stacktrace/development:
         min_duration: 10 # minimal duration in ms, default is 5, MUST be an integer
         filter: my.class.Name # optional, default is to include all spans
 ```

span-stacktrace/src/main/java/io/opentelemetry/contrib/stacktrace/StackTraceComponentProvider.java

@@ -16,7 +16,7 @@
 public class StackTraceComponentProvider implements ComponentProvider<SpanProcessor> {
   @Override
   public String getName() {
-    return "experimental_stacktrace";
+    return "stacktrace/development";
   }
 
   @Override

span-stacktrace/src/test/java/io/opentelemetry/contrib/stacktrace/StackTraceComponentProviderTest.java

@@ -22,7 +22,7 @@ void endToEnd() {
         "file_format: 1.0-rc.1\n"
             + "tracer_provider:\n"
             + "  processors:\n"
-            + "    - experimental_stacktrace: \n"
+            + "    - stacktrace/development: \n"
             + "        min_duration: 100\n"
             + "        filter: io.opentelemetry.contrib.stacktrace.StackTraceSpanProcessorTest$YesPredicate\n";