add factory method

Author: zeitlinger

instrumentation/ktor/ktor-2.0/library/src/main/kotlin/io/opentelemetry/instrumentation/ktor/v2_0/client/KtorClientTracingBuilder.kt

@@ -28,7 +28,7 @@ class KtorClientTracingBuilder {
 
   fun setOpenTelemetry(openTelemetry: OpenTelemetry) {
     this.openTelemetry = openTelemetry
-    this.clientBuilder = DefaultHttpClientInstrumenterBuilder(
+    this.clientBuilder = DefaultHttpClientInstrumenterBuilder.create(
       INSTRUMENTATION_NAME,
       openTelemetry,
       KtorHttpClientAttributesGetter

instrumentation/ktor/ktor-2.0/library/src/main/kotlin/io/opentelemetry/instrumentation/ktor/v2_0/server/KtorServerTracing.kt

@@ -48,7 +48,7 @@ class KtorServerTracing private constructor(
 
     fun setOpenTelemetry(openTelemetry: OpenTelemetry) {
       this.serverBuilder =
-        DefaultHttpServerInstrumenterBuilder(
+        DefaultHttpServerInstrumenterBuilder.create(
           INSTRUMENTATION_NAME,
           openTelemetry,
           KtorHttpServerAttributesGetter.INSTANCE