feat: Add max_columns control for anywidget mode

[shuoweil]

This PR introduces a max_columns configuration for anywidget mode, giving users control over how many columns are rendered in the interactive table. This is particularly useful for improving readability and performance when working with wide DataFrames.

Key Changes:

• Configurable Column Limit: Users can now set bigframes.options.display.max_columns to limit the number of displayed columns.
• Interactive Control: The TableWidget now includes a "Max columns" dropdown in the footer, allowing users to dynamically adjust this setting (options: 3, 5, 10, 15, 20, All).
• Smart Truncation: When columns exceed the limit, the table displays the first N/2 and last N/2 columns, separated by an ellipsis (...) column.
• Default Value: The default max_columns is set to 7 to provide a balanced view on standard screens without requiring horizontal scrolling.

Example Usage:

   1 import bigframes.pandas as bpd
   2 
   3 # Set global option
   4 bpd.options.display.max_columns = 10
   5 
   6 # Or use context manager
   7 with bpd.option_context("display.max_columns", 5):
   8     display(df)

verified at:

• vs code notebook: http://screencast/cast/NTE2MDM4NTkxNjE3NDMzNnw2ZGI5YjAxOS1jMw
• colab notebook: screen/A8CBDFHyoJTzkAu

Fixes #<452681068> 🦕

[review-notebook-app]

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