Function createExtensionManifest

Returns {
    action: { default_popup: string; default_title: string };
    background: { service_worker: string; type: "module" };
    content_scripts: {
        js: string[];
        matches: readonly string[];
        run_at: "document_idle";
    }[];
    description: string;
    host_permissions: string[];
    manifest_version: 3;
    name: string;
    permissions: string[];
    version: string;
    version_name?: string;
}