feat(context): Clean context API

Author: PerfectSlayer

components/context/src/main/java/datadog/context/Context.java

@@ -4,7 +4,6 @@
 import static datadog.context.ContextProviders.manager;
 
 import javax.annotation.Nullable;
-import javax.annotation.ParametersAreNonnullByDefault;
 
 /**
  * Immutable context scoped to an execution unit or carrier object.
@@ -36,7 +35,6 @@
  *
  * @see ContextKey
  */
-@ParametersAreNonnullByDefault
 public interface Context {
   /**
    * Returns the root context.

components/context/src/main/java/datadog/context/ContextBinder.java

@@ -1,9 +1,6 @@
 package datadog.context;
 
-import javax.annotation.ParametersAreNonnullByDefault;
-
 /** Binds context to carrier objects. */
-@ParametersAreNonnullByDefault
 public interface ContextBinder {
   /**
    * Returns the context attached to the given carrier object.

components/context/src/main/java/datadog/context/ContextKey.java

@@ -10,7 +10,7 @@
  */
 public final class ContextKey<T> {
   private static final AtomicInteger NEXT_INDEX = new AtomicInteger(0);
-  /** The key name, for debugging purpose only . */
+  /** The key name, for debugging purpose only. */
   private final String name;
   /** The key unique context, related to {@link IndexedContext} implementation. */
   final int index;

components/context/src/main/java/datadog/context/package-info.java

@@ -0,0 +1,4 @@
+@ParametersAreNonnullByDefault
+package datadog.context;
+
+import javax.annotation.ParametersAreNonnullByDefault;