Fix compilation errors: wrap HttpConstants.KNOWN_METHODS in HashSet constructor

The DeclarativeConfigUtil.getList().map(HashSet::new).orElse() pattern
produces Optional<HashSet<String>>, but HttpConstants.KNOWN_METHODS is
a Set<String>. Wrapping it in 'new HashSet<>()' fixes the type mismatch.

Fixes compilation errors in:
- AgentServletInstrumenterBuilder
- Servlet2SpanNameExtractor
- HttpUrlConnectionSingletons
- ElasticsearchRestJavaagentInstrumenterFactory
- HttpSpanDecorator (camel-2.20)
- AwsLambdaEventsInstrumenterFactory

Author: trask

instrumentation/aws-lambda/aws-lambda-events-common-2.2/library/src/main/java/io/opentelemetry/instrumentation/awslambdaevents/common/v2_2/internal/AwsLambdaEventsInstrumenterFactory.java

@@ -38,7 +38,7 @@ public static AwsLambdaFunctionInstrumenter createInstrumenter(
   private static Set<String> getKnownHttpMethods(OpenTelemetry openTelemetry) {
     return DeclarativeConfigUtil.getList(openTelemetry, "general", "http", "known_methods")
         .map(HashSet::new)
-        .orElse(HttpConstants.KNOWN_METHODS);
+        .orElse(new HashSet<>(HttpConstants.KNOWN_METHODS));
   }
 
   private static String spanName(AwsLambdaRequest input) {

instrumentation/camel-2.20/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/apachecamel/decorators/HttpSpanDecorator.java

@@ -58,7 +58,7 @@ private static Set<String> getKnownHttpMethods() {
     return DeclarativeConfigUtil.getList(
             GlobalOpenTelemetry.get(), "general", "http", "known_methods")
         .map(HashSet::new)
-        .orElse(HttpConstants.KNOWN_METHODS);
+        .orElse(new HashSet<>(HttpConstants.KNOWN_METHODS));
   }
 
   protected static String getHttpMethod(Exchange exchange, Endpoint endpoint) {

instrumentation/elasticsearch/elasticsearch-rest-common-5.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/elasticsearch/rest/ElasticsearchRestJavaagentInstrumenterFactory.java

@@ -41,6 +41,6 @@ private static Set<String> getKnownHttpMethods() {
     return DeclarativeConfigUtil.getList(
             GlobalOpenTelemetry.get(), "general", "http", "known_methods")
         .map(HashSet::new)
-        .orElse(HttpConstants.KNOWN_METHODS);
+        .orElse(new HashSet<>(HttpConstants.KNOWN_METHODS));
   }
 }

instrumentation/http-url-connection/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/httpurlconnection/HttpUrlConnectionSingletons.java

@@ -45,7 +45,7 @@ private static Set<String> getKnownHttpMethods() {
     return DeclarativeConfigUtil.getList(
             GlobalOpenTelemetry.get(), "general", "http", "known_methods")
         .map(HashSet::new)
-        .orElse(HttpConstants.KNOWN_METHODS);
+        .orElse(new HashSet<>(HttpConstants.KNOWN_METHODS));
   }
 
   private HttpUrlConnectionSingletons() {}

instrumentation/servlet/servlet-2.2/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/servlet/v2_2/Servlet2SpanNameExtractor.java

@@ -28,7 +28,7 @@ private static Set<String> getKnownHttpMethods() {
     return DeclarativeConfigUtil.getList(
             GlobalOpenTelemetry.get(), "general", "http", "known_methods")
         .map(HashSet::new)
-        .orElse(HttpConstants.KNOWN_METHODS);
+        .orElse(new HashSet<>(HttpConstants.KNOWN_METHODS));
   }
 
   @Override

instrumentation/servlet/servlet-common/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/servlet/AgentServletInstrumenterBuilder.java

@@ -104,6 +104,6 @@ private static Set<String> getKnownHttpMethods() {
     return DeclarativeConfigUtil.getList(
             GlobalOpenTelemetry.get(), "general", "http", "known_methods")
         .map(HashSet::new)
-        .orElse(HttpConstants.KNOWN_METHODS);
+        .orElse(new HashSet<>(HttpConstants.KNOWN_METHODS));
   }
 }