Icon List block - Able to add border lines between icon list items

[andeng1106]

Issue #2025 should be done first before proceeding with this.

Feature specs

• should be able to enable/disable the line
• should be able to change the thickness of the line
• should be able to change the width of the line
• should be able to change the color of the line

Is your feature request related to a problem? Please describe.

• Related to this post: https://www.facebook.com/groups/wpstackable/permalink/1039202623634917/?_rdc=1&_rdr
• User wanted to put border bottom border lines to separate the icon list items.

Describe the solution you'd like Add a feature to be able to add border lines between icon list items.

Describe alternatives you've considered N/A