Add hook to observe multiple intersections

[marlonschlosshauer]

We currently have a neat hook to check for the intersection of a single element (via a ref). For another project we needed to check which of many elements, are intersecting.

Example: We have an RTE with headlines. We want to show which headline is currently visible & highlight it in a table of contents.

FYI: The current code is lifted from that other project and slightly modified to somewhat fit the shape of the existing useIntersection hook.

Todos:

• Validate current strategy
• Add support for remaining props
• Test

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Latest commit: 94d871f

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