Use transferable objects for signing worker communication

Transfer signature buffer back to main thread instead of copying, improving performance for large messages.

Author: mondoreale

packages/sdk/src/signature/SigningWorker.ts

@@ -1,4 +1,4 @@
-import { expose } from 'comlink'
+import { expose, transfer } from 'comlink'
 import {
     createSignatureFromData,
     SigningResult,
@@ -9,7 +9,11 @@ const workerApi = {
     createSignature: async (
         request: SigningRequest
     ): Promise<SigningResult> => {
-        return createSignatureFromData(request)
+        const result = await createSignatureFromData(request)
+        if (result.type === 'success') {
+            return transfer(result, [result.signature.buffer])
+        }
+        return result
     },
 }