Add support for custom colors for lines in .pending state

[rcole34]

Description

Add support for custom colors for lines in .pending state

Type of change

• Bug fix
• New feature
• Breaking change
• This change requires a documentation update

How Has This Been Tested

Manually tested to change colors of rounded lines in pending state

• Unit Testing
• UI Testing

Test Configuration

• Xcode version: 12.4
• Device/Simulator 11 Pro simulator
• iOS version 14.4
• MacOSX version 11.2.1

Checklist:

For checklist items not applicable, mention NA in front of it with some comment if applicable.

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• Add comments to code particularly in hard-to-understand areas
• My changes generate no new warnings
• NA I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes before pushing the pull request