Dictionary Values are Not Displayed correctly

[JohnOmernik]

Describe the bug
When a Dictionary object is in a column of a Data frame, or even in a list item of a dataframe, it is displayed as [object Object] instead of a more intuitive "use str repr of dictionary".

To Reproduce
Steps to reproduce the behavior:

1. mydf = pd.DataFrame([{'dict_field':{'hi':'ya'}}, {'dict_field':{'hi':'yo'}}])
2. Render this in ipydataframe
3. Observe [object Object] rather than {'hi': 'ya'}
4. ????
5. Profit (Sorry, couldn't help myself)

Expected behavior
Like lists, (which are rendered correctly unless they contain dictionaries), ipydatagrid should use a str repr of the dictionary object.
I am not sure how that will affect performance, but if performance is a major concern, perhaps make a flag that defaults to False that can override and force that str repr to be displayed

Environment (please complete the following information):

• Jupyter Lab running on Windows in Chrome

[tfmark]

A workaround could be to json-ify your data

import ipydatagrid
import pandas as pd
import json

df = pd.DataFrame([{'dict_field':{'hi':'ya'}}, {'dict_field':{'hi':'yo'}}])
df["dict_field"] = df["dict_field"].apply(json.dumps)

ipydatagrid.DataGrid(
    dataframe=df,
    column_widths=dict(dict_field=100),
)

.. which is how I think we'll deal with the dicts in our table if we decide that our users want to see them...