Prepend encryption flag iue to platform metadata

Sending extra metadata in the handshake will allow us to detect when
encryption is enabled. `iue` for In-Use Ecnryption was chosen to save
bytes (as metadata will be truncated if it exceeds byte limit)

Author: paulinevos

src/Client.php

@@ -48,9 +48,7 @@
 
 use function array_diff_key;
 
-/**
- * @psalm-type stage = StageInterface|array<string,mixed>|stdClass
- */
+/** @psalm-type stage = StageInterface|array<string,mixed>|stdClass */
 class Client implements Stringable
 {
     public const DEFAULT_URI = 'mongodb://127.0.0.1/';
@@ -389,7 +387,7 @@ public function startSession(array $options = []): Session
      *
      * @see Watch::__construct() for supported options
      * @psalm-param list<stage> $pipeline Aggregation pipeline
-     * @param array $options  Command options
+     * @param array $options Command options
      * @throws InvalidArgumentException for parameter/option parsing errors
      */
     public function watch(array $pipeline = [], array $options = []): ChangeStream