Make bridge beans conditionalonmissingbean; fixes gh-52

Author: marcingrzejszczak

spring-cloud-sleuth-otel-autoconfigure/src/main/java/org/springframework/cloud/sleuth/autoconfig/otel/OtelBridgeConfiguration.java

@@ -74,6 +74,7 @@
 class OtelBridgeConfiguration {
 
 	@Bean
+	@ConditionalOnMissingBean
 	Tracer otelTracerBridge(io.opentelemetry.api.trace.Tracer tracer, ApplicationEventPublisher publisher,
 			CurrentTraceContext currentTraceContext, SleuthBaggageProperties sleuthBaggageProperties) {
 		return new OtelTracer(tracer, publisher, new OtelBaggageManager(currentTraceContext,
@@ -89,11 +90,13 @@ OtelCurrentTraceContext otelCurrentTraceContext(ApplicationEventPublisher publis
 	}
 
 	@Bean
+	@ConditionalOnMissingBean
 	SpanCustomizer otelSpanCustomizer() {
 		return new OtelSpanCustomizer();
 	}
 
 	@Bean
+	@ConditionalOnMissingBean
 	Propagator otelPropagator(ContextPropagators contextPropagators, io.opentelemetry.api.trace.Tracer tracer) {
 		return new OtelPropagator(contextPropagators, tracer);
 	}
@@ -112,6 +115,7 @@ SpanExporterCustomizer noOpSleuthSpanFilterConverter() {
 	static class TraceOtelHttpBridgeConfiguration {
 
 		@Bean
+		@ConditionalOnMissingBean
 		HttpClientHandler otelHttpClientHandler(io.opentelemetry.api.OpenTelemetry openTelemetry,
 				@Nullable @HttpClientRequestParser HttpRequestParser httpClientRequestParser,
 				@Nullable @HttpClientResponseParser HttpResponseParser httpClientResponseParser,
@@ -121,6 +125,7 @@ HttpClientHandler otelHttpClientHandler(io.opentelemetry.api.OpenTelemetry openT
 		}
 
 		@Bean
+		@ConditionalOnMissingBean
 		HttpServerHandler otelHttpServerHandler(io.opentelemetry.api.OpenTelemetry openTelemetry,
 				@Nullable @HttpServerRequestParser HttpRequestParser httpServerRequestParser,
 				@Nullable @HttpServerResponseParser HttpResponseParser httpServerResponseParser,