feat: implemented getWarningsBySeverity

ref: N25B-450

src/pages/VisProgPage/visualProgrammingUI/EditorWarnings.tsx

@@ -76,7 +76,26 @@ export function editorWarningRegistry(get: ZustandGet, set: ZustandSet) : Editor
     ['WARNING', new Set<{ nodeId: NodeId, warningKey: WarningKey}>()]
   ]),
 
-  getWarningsBySeverity: (_warningSeverity) => { return []},
+  getWarningsBySeverity: (warningSeverity) => {
+    const wRegistry = get().editorWarningRegistry;
+    const sIndex = get().severityIndex;
+
+    const warningKeys = sIndex.get(warningSeverity);
+
+    const warnings: EditorWarning[] = [];
+
+    warningKeys?.forEach(
+      ({nodeId, warningKey}) => {
+        const warning = wRegistry.get(nodeId)?.get(warningKey);
+
+        if (warning) {
+          warnings.push(warning);
+        }
+      }
+    )
+
+    return warnings;
+  },
 
   isProgramValid: () => { return true},