Rewrite ra_prof's profile printing

This changes the way we print things to first construct a mapping from
events to the children and uses that mapping to actually print things.
It should not change the actual output that we produce.

The new approach two benefits:

 * It avoids a potential quadratic behavior of the previous approach.
   For instance, for a vector of N elements:
   ```
   [Message{level: (N - 1)}, ..., Message{level: 1}, Message{level: 0}]
   ```
   we would first do a linear scan to find entry with level 0, then
   another scan to find one with level 1, etc.

 * It makes it much easier to improve the output in the future, because
   we now pre-compute the children for each entry and can easily take
   that into account when printing.

Signed-off-by: Michal Terepeta <[email protected]>

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