Table: Creating frozen columns (similar to header - but for columns)

[AbdealiLoKo]

While Plotly has the ability to create a "header", it would be nice to also create "frozen-columns" or something similar:

Excel has the concept of frozen columns. Pandas (in python) uses indexes.

Note that while a very similar thing could be done by applying <b> for every cells.values which needs this, it gets difficult to manage the empty cells in the first row, and also the background gets a bit difficult to manage.

Example comparing a HTML version and plotly version:
https://codepen.io/AbdealiJK/pen/OGJooV

[etpinard]

Merged into #2056