feat: Add warningFilter to SvelteConfig (#626)

Author: baseballyama

Diff for: .changeset/smart-rats-decide.md

@@ -0,0 +1,5 @@
+---
+"svelte-eslint-parser": minor
+---
+
+feat: Add `warningFilter` to `SvelteConfig`

Diff for: src/svelte-config/index.ts

@@ -13,6 +13,7 @@ export type SvelteConfig = {
     warning: Compiler.Warning,
     defaultHandler: (warning: Compiler.Warning) => void,
   ) => void;
+  warningFilter?: (warning: Compiler.Warning) => boolean;
   [key: string]: unknown;
 };