fix: allow for scrollIndicatorInsets to be supplied to scroll containers

[e-younan]

Description

This PR allows for scrollIndicatorInsets to be supplied to the scroll containers.

Motivation and Context

This fix was introduced since there was no way to merge the top inset with the supplied insets before.

How Has This Been Tested?

This was tested in the example project.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have followed the guidelines in the README.md file.
• I have updated the documentation as necessary.
• My changes generate no new warnings.