Remove unnecessary InvalidArgumentExceptions (elastic#1069)

There are some locations where an object is type hinted and inside the method a check is performed to verify the type again. This is not necessary as PHP will take care of this. A consequence of this is that these methods no longer throw an instance of `\Elasticsearch\Common\Exceptions\InvalidArgumentException` but of `\InvalidArgumentException`. As theres no PHPDoc indicating that the aforementioned exception is thrown by these methods I dont see any issues with this.

Author: timoschinkel

src/Elasticsearch/ClientBuilder.php

@@ -305,21 +305,13 @@ public function setHandler($handler): ClientBuilder
 
     public function setLogger(LoggerInterface $logger): ClientBuilder
     {
-        if (!$logger instanceof LoggerInterface) {
-            throw new InvalidArgumentException('$logger must implement \Psr\Log\LoggerInterface!');
-        }
-
         $this->logger = $logger;
 
         return $this;
     }
 
     public function setTracer(LoggerInterface $tracer): ClientBuilder
     {
-        if (!$tracer instanceof LoggerInterface) {
-            throw new InvalidArgumentException('$tracer must implement \Psr\Log\LoggerInterface!');
-        }
-
         $this->tracer = $tracer;
 
         return $this;