Expose some private variables

Author: allflame

src/Client/ThriftClient.php

@@ -31,6 +31,11 @@ public function add(SpanInterface $span): ClientInterface
         return $this;
     }
 
+    public function getSpans() : array
+    {
+        return $this->spans;
+    }
+
     public function flush(): ClientInterface
     {
         switch (PHP_SAPI) {

src/Tracer/Tracer.php

@@ -71,6 +71,11 @@ public function getContext(SpanContext $userContext = null): ?SpanContext
         return null;
     }
 
+    public function getClient(): ClientInterface
+    {
+        return $this->client;
+    }
+
     public function debug(string $operationName, array $tags = []): SpanInterface
     {
         $span = $this->factory->parent($this, $operationName, str_shuffle('01234567890abcdef'), $tags);