add missing annotations

Author: adinauer

sentry/src/main/java/io/sentry/NoOpSentryClient.java

@@ -2,6 +2,7 @@
 
 import io.sentry.protocol.SentryId;
 import io.sentry.protocol.SentryTransaction;
+import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -54,6 +55,7 @@ public SentryId captureEnvelope(@NotNull SentryEnvelope envelope, @Nullable Hint
   }
 
   @Override
+  @ApiStatus.Experimental
   public @NotNull SentryId captureCheckIn(
       @NotNull CheckIn checkIn, @Nullable Scope scope, @Nullable Hint hint) {
     return SentryId.EMPTY_ID;

sentry/src/main/java/io/sentry/SentryClient.java

@@ -672,6 +672,7 @@ public void captureSession(final @NotNull Session session, final @Nullable Hint
   }
 
   @Override
+  @ApiStatus.Experimental
   public @NotNull SentryId captureCheckIn(
       @NotNull CheckIn checkIn, final @Nullable Scope scope, @Nullable Hint hint) {
     if (hint == null) {