Improve floor label algorithm for d3 hierarchy

[RomanenkoVladimir]

Feature request

Description

As a user, I want to visualize maps with many folder labels, without them getting too long

Acceptance criteria

• Maps with folder labels are rendered
• No buildings disappear due to folder labels
• Text of folder labels is big enough to be readable

Development notes (optional Task Breakdown)

• [ ] Implement a way to recognize floor labels that are too small to render
• [ ] Change current calculation to account for visualized labels
• [ ] Change folder sizes to achieve a rectangle map

Open questions

• Passing an algorithm to marginRight() (which is what we use for folder labels) is currently not supported by d3-hierarchy
  • We could either try to re-implement the feature, fork the hierarchy library or create an official feature PR

Connected to #1609 and #3044