Add ability to call interactive on bound functions

[philippjfr]

Implements functionality requested in #673

from bokeh import sampledata

ticker = pn.widgets.Select(options=['AAPL', 'IBM', 'GOOG', 'MSFT'], name='Ticker')

def stock_df(ticker):
    df = pd.DataFrame(getattr(sampledata.stocks, ticker))
    df['date'] = pd.to_datetime(df.date)
    return df

stock_dfi = hvplot.bind(stock_df, ticker).interactive(width=600)

stock_dfi.head(10)

• Add tests
• Automatically detect whether to use DataFrameInteractive or XArrayInteractive object

[jbednar]

Looks great! Thanks for doing this.

[MarcSkovMadsen]

Love this

[philippjfr]

@maximlt Please review.

[maximlt]

I'd say there is one outstanding issue to fix, my other comments or suggestions are somewhat minor.

[philippjfr]

Sorry for polluting this PR but I pushed some other changes:

• Accessor resolution now implemented consistently via one codepath
• Accessors now always return a new interactive object, previously it would act by changing the object inplace resulting in a lot of oddness when you chained that object
• Fixed docstring generation for methods