BREAKING CHANGE(SmartFileFactory): Refactor to in-memory file API and introduce SmartFileFactory; delegate filesystem operations to @push.rocks/smartfs; bump to 12.0.0

test/testassets/temp/mytest-fromdir.json

@@ -0,0 +1,7 @@
+{
+  "key1": "this works",
+  "key2": "this works too",
+  "key3": {
+    "nestedkey1": "hello"
+  }
+}