Feat: Http SSE transport as per '2024-11-05' MCP spec (#34)

Co-authored-by: TJ Miller <tj@themillers.co>

Author: vinitkadam03

src/Enums/Transport.php

@@ -8,4 +8,5 @@ enum Transport: string
 {
     case Http = 'http';
     case Stdio = 'stdio';
+    case HttpSse = 'http_sse';
 }