Scene storage backend integration (#51)

This PR adds Storyteller.ai API integration for saving and loading
Storyteller Studio scenes to/from the backend.

### Known issues
* The skybox is not currently stored in the serialized scene format

package-lock.json

@@ -14,7 +14,8 @@
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@@ -29,6 +30,7 @@
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+    "node_modules/@types/uuid": {
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@@ -10194,7 +10202,6 @@
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-      "dev": true,
       "funding": [
         "https://github.com/sponsors/broofa",
         "https://github.com/sponsors/ctavan"