Static table import (table_from_...) should not be under `pw.debug`

[dxtrous]

Is your feature request related to a problem? Please describe.
A number of table_from_... import functions, such as those from Pandas, Markdown, etc. are hidden away in the pw.debug module. They should not be.

I am not sure to what extent this is also true for table export functions (table_to_...).

Describe the solution you'd like
Moving these functions to some other more natural module for static data import, or perhaps allowing pw.Table(dataframe_like_object) constructors directly.

Describe alternatives you've considered
N/A

Additional context
This is a topic that comes up regularly in Discord user questions and also in issues like #30.