Address comments

Author: jerrytfleung

src/Instrumentation/PDO/src/SqlServerPropagator.php renamed to src/Instrumentation/PDO/src/ContextInfoPropagator.php

@@ -4,7 +4,7 @@
 
 namespace OpenTelemetry\Contrib\Instrumentation\PDO;
 
-class SqlServerPropagator implements SqlPropagatorInterface
+class ContextInfoPropagator implements SqlPropagatorInterface
 {
     public static function inject(string $query, array $comments): string
     {

src/Instrumentation/PDO/tests/Unit/SqlServerPropagatorTest.php renamed to src/Instrumentation/PDO/tests/Unit/ContextInfoPropagatorTest.php

@@ -4,10 +4,10 @@
 
 namespace OpenTelemetry\Tests\Instrumentation\PDO\tests\Unit;
 
-use OpenTelemetry\Contrib\Instrumentation\PDO\SqlServerPropagator;
+use OpenTelemetry\Contrib\Instrumentation\PDO\ContextInfoPropagator;
 use PHPUnit\Framework\TestCase;
 
-class SqlServerPropagatorTest extends TestCase
+class ContextInfoPropagatorTest extends TestCase
 {
     public function testInject()
     {
@@ -17,7 +17,7 @@ public function testInject()
             'key3' => 'value3',
         ];
         $query = 'SELECT 1;';
-        $result = SqlServerPropagator::inject($query, $comments);
+        $result = ContextInfoPropagator::inject($query, $comments);
         $this->assertEquals('SELECT 1;', $result);
     }