feat: Wrap SessionContext in Arc to enable external access

Author: zuston

datafusion-postgres/src/handlers.rs

@@ -62,8 +62,10 @@ pub struct DfSessionService {
 }
 
 impl DfSessionService {
-    pub fn new(session_context: SessionContext, catalog_name: Option<String>) -> DfSessionService {
-        let session_context = Arc::new(session_context);
+    pub fn new(
+        session_context: Arc<SessionContext>,
+        catalog_name: Option<String>,
+    ) -> DfSessionService {
         let parser = Arc::new(Parser {
             session_context: session_context.clone(),
         });