Introduce reprs for some of the base objects

[rgbkrk]

This introduces ipython / Jupyter representations for Python objects to allow easier viewing in a notebook.

For instance, running this code will display all the charts from lida.visualize

i = 0
library = "seaborn"
textgen_config = TextGenerationConfig(n=1, temperature=0.2, use_cache=True)
charts = lida.visualize(
    summary=summary, goal=goals[i], textgen_config=textgen_config, library=library
)
for chart in charts:
    display(chart)

and you can also just the chart be the execution result for the cell:

library = "seaborn"
textgen_config = TextGenerationConfig(n=1, temperature=0.2, use_cache=True)
charts = lida.visualize(
    summary=summary, goal=goals[i], textgen_config=textgen_config, library=library
)
charts[0]

Additionally, I did the same for goals:

Working on updating the notebook example as well once my machine has the infographics dependencies working well.

[rgbkrk]

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