bug/partition_json can't parse json file as one dictionary

[yuming-long]

Describe the bug
a user saw error while partition this json subject:

{
    "id": 1234,
    "description": "this is a test"
}

error:

Traceback (most recent call last):
  File "/Users/yumingl/develops/unstructured/test.py", line 7, in <module>
    elements = partition(filename="test.json")
  File "/Users/yumingl/develops/unstructured/unstructured/partition/auto.py", line 371, in partition
    raise ValueError(
ValueError: Detected a JSON file that does not conform to the Unstructured schema. partition_json currently only processes serialized Unstructured output.

To Reproduce
save subject above as file test.json and run with elements = partition(filename="test.json")

Expected behavior
should get return elements output from the dict

Additional context
The bug here is we only accept list of dict pattern for json files, and we should expand it to accept json file with only one dictionary or more potential pattern of json file

[MthwRobinson]

Closing this in favor of #1038