Add ESLint rule to enforce member ordering by access modifiers

Co-authored-by: weboko <[email protected]>

Author: Copilot

.eslintrc.json

@@ -31,6 +31,19 @@
       }
     ],
     "@typescript-eslint/explicit-member-accessibility": "error",
+    "@typescript-eslint/member-ordering": [
+      "error",
+      {
+        "default": [
+          "static-field",
+          "static-method",
+          "public-field",
+          "public-method",
+          "private-field",
+          "private-method"
+        ]
+      }
+    ],
     "@typescript-eslint/no-unused-vars": ["warn", { "argsIgnorePattern": "^_" }],
     "prettier/prettier": [
       "error",

packages/enr/src/enr.ts

@@ -32,7 +32,6 @@ export enum TransportProtocolPerIpVersion {
 
 export class ENR extends RawEnr implements IEnr {
   public static readonly RECORD_PREFIX = "enr:";
-  public peerId?: PeerId;
 
   public static create(
     kvs: Record<ENRKey, ENRValue> = {},
@@ -52,6 +51,8 @@ export class ENR extends RawEnr implements IEnr {
     return enr;
   }
 
+  public peerId?: PeerId;
+
   public get nodeId(): NodeId | undefined {
     switch (this.id) {
       case "v4":