rewrote impose to use new Operator class,

dependencies (pdfcpu) can be made environment-aware using tsconfig.json

server-node/declarations/pdfcpu.d.ts

@@ -0,0 +1,3 @@
+declare module '#pdfcpu' {
+    export function oneToOne(wasmArray: string[], snapshot: Uint8Array): Promise<Uint8Array>;
+}