Make `col_width` customizable in Display class

[Anselmoo]

trafficstars

This pull request adds the ability to customize the col_width parameter in the Display class of the oracle.py file. The col_width parameter determines the width of the columns when printing larger proposed model names.

The following commits are included in this pull request:

• test: Add test for display col_width parameter: This commit adds a test case to ensure that the col_width parameter is working correctly.

• feat: Add property and setter for col_width: This commit adds a property and setter method for the col_width parameter in the Oracle class.

• chore: Update Display class in oracle.py with col_width parameter: This commit updates the Display class in the oracle.py file to include the col_width parameter.

Fixes #1024