Fix JSON serialization error when creating flow runs

[peytonrunyan]

Closes #6962

flow.serialize_parameters is called when the client creates a flow run. This can return invalid JSON in certain cases, such as when serializing dataframes. pd.DataFrame({'col':['1']}) -> {"col": {0: "1"}}.

This resulted in an error when calling FlowRunCreate.dict(json_compatible=True).

This pull request modifies the FlowRunCreate to use orjson.dumps with OPT_NON_STR_KEYS enabled to handle these cases. The code is modified at the child-level because allowing non-string keys has performance implications, so this limits the hit to creating flow runs.

I tried a very simple flow with print statements to check that this is behaving as expected in aggregate (the combination of parameter serialization + flow run serialization), but I'd like a sanity check from @madkinsz to make sure that I'm not missing something.

from prefect import task, flow
import pandas as pd

@task
def task1():
    return 'complete'
    
@flow
def flow1(df):
    print(df.dtypes)
    print(df.head())
    task()
    
df_works = pd.DataFrame({'col':[1]})
flow1(df_works)

df_used_to_error = pd.DataFrame({'col':['1']})
flow1(df_used_to_error)

08:56:01.701 | INFO    | prefect.engine - Created flow run 'masterful-lorikeet' for flow 'flow1'
col    int64
dtype: object
   col
0    1
08:56:01.921 | INFO    | Flow run 'masterful-lorikeet' - Finished in state Completed()
08:56:02.029 | INFO    | prefect.engine - Created flow run 'mysterious-jackdaw' for flow 'flow1'
col    object
dtype: object
  col
0   1
08:56:02.201 | INFO    | Flow run 'mysterious-jackdaw' - Finished in state Completed()

Example

Checklist

• This pull request references any related issue by including "closes <link to issue>"
  • If no issue exists and your change is not a small fix, please create an issue first.
• This pull request includes tests or only affects documentation.
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[anna-geller]

Quick QA:

Version:             2.6.5
API version:         0.8.3
Python version:      3.10.6
Git commit:          9fc2658f
Built:               Thu, Oct 27, 2022 2:24 PM
OS/Arch:             darwin/arm64
Profile:             dev
Server type:         cloud

Using this branch, works:

[zanieb]

@zangell44 any qualms?

I like that this is scoped to the create action!