crypto: allow KeyObjects in postMessage

This change allows sharing KeyObjects between threads via postMessage.
The receiver acquires a new KeyObject and a new KeyObjectHandle, but
refers to the same KeyObjectData:

+-------------------+
| NativeKeyObject 1 | ------------------------------------------+
+-------------------+                                           |
        ^                                                       |
     extends                                                    |
        |                                                       |
+-------------------+    +-------------------+                  |
| KeyObject 1  (JS) | -> | KeyObjectHandle 1 | --------------+  |
+-------------------+    +-------------------+               |  |
                                                             |  |
                                                             |  |
                                                             |  |
                                                             |  |
                                                             |  |
+-------------------+                                        |  |
| NativeKeyObject 2 | ------------------------------------+  |  |
+-------------------+                                     |  |  |
        ^                                                 |  |  |
     extends                                              |  |  |
        |                                                 |  |  |
+-------------------+    +-------------------+            |  |  |
| KeyObject 2  (JS) | -> | KeyObjectHandle 2 | --------+  |  |  |
+-------------------+    +-------------------+         |  |  |  |
                                                       |  |  |  |
                                                       |  |  |  |
                                                       |  |  |  |
                                                       |  |  |  |
                                                       |  |  |  |
+-------------------+                                  |  |  |  |
| NativeKeyObject 3 | ------------------------------+  |  |  |  |
+-------------------+                               |  |  |  |  |
        ^                                           |  |  |  |  |
     extends                                        |  |  |  |  |
        |                                           v  v  v  v  v
+-------------------+    +-------------------+    +---------------+
| KeyObject 3  (JS) | -> | KeyObjectHandle 3 | -> | KeyObjectData |
+-------------------+    +-------------------+    +---------------+

Co-authored-by: Anna Henningsen <anna@addaleax.net>

PR-URL: https://github.com/nodejs/node/pull/33360


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>