fix(intl): remove circular dependency on datetime component (#1299)

Author: innocenzi

packages/intl/composer.json

@@ -9,9 +9,11 @@
 		"symfony/yaml": "^7.3",
 		"tempest/core": "dev-main",
 		"tempest/container": "dev-main",
-		"tempest/datetime": "dev-main",
 		"tempest/support": "dev-main"
 	},
+	"require-dev": {
+		"tempest/datetime": "dev-main"
+	},
 	"autoload": {
 		"files": [
 			"src/functions.php",

packages/intl/src/MessageFormat/Functions/DateTimeFunction.php

@@ -13,6 +13,10 @@ final class DateTimeFunction implements FormattingFunction
 
     public function format(mixed $value, array $parameters): FormattedValue
     {
+        if (! class_exists(DateTime::class)) {
+            throw new \RuntimeException('`tempest/datetime` is required to use the `datetime` function.');
+        }
+
         $datetime = DateTime::parse($value);
         $formatted = $datetime->format(Arr\get_by_key($parameters, 'pattern'));