Collapse rows with low total time % in tree table by default

# Problem

For complex queries, the tree table may show many rows (e.g. 20+), however some of them are very unimportant compared to others. E.g. rows that take up less than 5% of the total time of the query would rarely be considered interesting.

So one way to declutter the UI, would be to collapse any row that takes less than 5% of the total time, so the children don't take up any space. Here is how this could look for the CTESleepUnion example:

Before:


After:


# Proposal

Create a PR that automatically collapses these kind of rows.