Feature Request: Ability to overlay a candle chart over another (share axes)

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Thank you for your work on updating mplfinance!

Using the deprecated mpl-finance, I was able to put 2 `candlestick_ohlc()` charts on top of each other (overlaid, sharing the same axes), and a table below the chart, all within a single figure that could be saved.

Now, I can use `returnfig=True` to export the figure and axes, but not sure how to actually use those later. `ax` is not a valid kwarg in `plot()`, as it was in `candlestick_ohlc()`. And not sure how to draw the chart inside a parent figure. Should `fig` be a kwarg for `plot()`?

Thank you.

Empieza leyendo el comportamiento actual de plot() y returnfig, y compáralo después con el uso obsoleto de ax en candlestick_ohlc(). Aclara cómo deben proporcionarse una Figure padre y unos Axes compartidos, incluida la tabla solicitada debajo del gráfico. Se considera terminado cuando se puedan superponer dos gráficos de velas en una Figure que se pueda guardar.

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