[Feature] Show dataframe

[quigleyj97]

Recording an idea I had as a possible feature to add. Essentially, you would do something like:

# In [1]
import jlspreadsheet as jls
jls.activate()

# In [2]
import pandas as pd
df = pd.load_excel("my_wonderful_spreadsheet.xls")

# In [3]
jls.show(df)

When you call that show function, a new JupyterLab tab will appear in your client with a spreadsheet view of the dataframe.

[quigleyj97]

Closing this as the issue is ostensibly more appropriate to solve using the Jupyter Data Registry, and the mainline branch now supports it.