Feature/better sticky

[lbebber]

What is the purpose of this pull request?

Allows multiple or interspersed rows to be sticky

(look at the row with the search bar + the bottom border of the header):
https://stickyheader--storecomponents.myvtex.com/basic-t-shirt/p

What problem is this solving?

How should this be manually tested?

Screenshots or example usage

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Requires change to documentation, which has been updated accordingly.