It would be nice if Client was robust to simplejson vs. json

[zangell44]

Description

Currently, Client._request only catches json.decoder.JSONDecoderError. However, if the simplejson library is present in the environment, requests defaults to using simplejson instead of json. psf/requests#3052

Instead of catching and raising a useful message, Prefect will raise simplejson.errors.JSONDecoderError

Expected Behavior

It would be very nice if the Client could handle both cases. I'll have a draft PR coming in a minute here.

Reproduction

1. Install simplejson in your environment (pip install simplejson)
2. Make sure you log out of prefect via cli prefect auth logout
3. Run a hello world flow and try to register it

from prefect import task, Flow

@task
def say_hello():
    print("Hello, world!")

with Flow('test') as flow:
	say_hello()

flow.register(project_name='test')

Here, you'll see the simplejson error come through the stack trace instead of an error informing you about the actual issue.

Environment

pip install simplejson

[joshmeek]

Closed by #3152