Implement IteratorAggregate and Countable on ParseResult

Users previously had to call getParsedRawData() to iterate over results
or countResults() for counting. ParseResult now implements \IteratorAggregate
and \Countable so it can be used directly in foreach loops and with count(),
reducing boilerplate in consumer code.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: aymanrb

src/ParseResult.php

@@ -6,7 +6,7 @@
 
 use aymanrb\UnstructuredTextParser\Exception\InvalidParsedDataKeyException;
 
-class ParseResult
+class ParseResult implements \IteratorAggregate, \Countable
 {
     private array $parsedRawData = [];
 
@@ -38,6 +38,16 @@ public function countResults(): int
         return count($this->parsedRawData);
     }
 
+    public function count(): int
+    {
+        return $this->countResults();
+    }
+
+    public function getIterator(): \ArrayIterator
+    {
+        return new \ArrayIterator($this->parsedRawData);
+    }
+
     public function keyExists(string $key): bool
     {
         return array_key_exists($key, $this->parsedRawData);