Include estimated minimum and maximum score in result

[langdal]

In order to make the automatic calculation of of Xi values on the frontend we need to know how the model estimates the range of the score function.

A new entry should be added to the result payload in the openapi spec. E.g., under result.results.models.score_bounds
Should be added around here:

process-optimizer-api/optimizerapi/openapi/specification.yml

Line 204 in 5c321f9

properties: