feat(bootstrap): Migrate to JSON component

dd-java-agent/build.gradle

@@ -201,6 +201,7 @@ tasks.withType(GenerateMavenPom).configureEach { task ->
 }
 
 dependencies {
+  implementation project(path: ':components:json')
   modules {
     module("com.squareup.okio:okio") {
       replacedBy("com.datadoghq.okio:okio") // embed our patched fork

dd-java-agent/src/main/java/datadog/trace/bootstrap/BootstrapInitializationTelemetry.java

@@ -1,13 +1,14 @@
 package datadog.trace.bootstrap;
 
+import datadog.json.JsonBuffer;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.util.concurrent.TimeUnit;
 
 /** Thread safe telemetry class used to relay information about tracer activation. */
 public abstract class BootstrapInitializationTelemetry {
   /** Returns a singleton no op instance of initialization telemetry */
-  public static final BootstrapInitializationTelemetry noOpInstance() {
+  public static BootstrapInitializationTelemetry noOpInstance() {
     return NoOp.INSTANCE;
   }
 
@@ -17,8 +18,7 @@ public static final BootstrapInitializationTelemetry noOpInstance() {
    *
    * @param forwarderPath - a String - path to forwarding executable
    */
-  public static final BootstrapInitializationTelemetry createFromForwarderPath(
-      String forwarderPath) {
+  public static BootstrapInitializationTelemetry createFromForwarderPath(String forwarderPath) {
     return new JsonBased(new ForwarderJsonSender(forwarderPath));
   }
 
@@ -85,8 +85,8 @@ public void finish() {}
   public static final class JsonBased extends BootstrapInitializationTelemetry {
     private final JsonSender sender;
 
-    private JsonBuffer metaBuffer = new JsonBuffer();
-    private JsonBuffer pointsBuffer = new JsonBuffer();
+    private final JsonBuffer metaBuffer = new JsonBuffer();
+    private final JsonBuffer pointsBuffer = new JsonBuffer();
 
     // one way false to true
     private volatile boolean incomplete = false;
@@ -189,8 +189,8 @@ public void finish() {
     }
   }
 
-  public static interface JsonSender {
-    public abstract void send(JsonBuffer buffer) throws IOException;
+  public interface JsonSender {
+    void send(JsonBuffer buffer) throws IOException;
   }
 
   public static final class ForwarderJsonSender implements JsonSender {

dd-java-agent/src/test/groovy/datadog/trace/bootstrap/BootstrapInitializationTelemetryTest.groovy

@@ -1,7 +1,6 @@
-package datadog.trace.agent
+package datadog.trace.bootstrap
 
-import datadog.trace.bootstrap.BootstrapInitializationTelemetry
-import datadog.trace.bootstrap.JsonBuffer
+import datadog.json.JsonBuffer
 import spock.lang.Specification
 
 class BootstrapInitializationTelemetryTest extends Specification {