Bump compat LossFunctions = "0.9" and address breakage

[ablaom]

Closes: #896 #570

[codecov-commenter]

Codecov Report

Merging #898 (9603c64) into dev (4cb9ba7) will not change coverage.
The diff coverage is n/a.

📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

@@           Coverage Diff           @@
##              dev     #898   +/-   ##
=======================================
  Coverage   85.81%   85.81%           
=======================================
  Files          40       40           
  Lines        3567     3567           
=======================================
  Hits         3061     3061           
  Misses        506      506           

Impacted Files	Coverage Δ
src/measures/loss_functions_interface.jl	73.21% <ø> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[ablaom]

Thanks @ToucheSir . FYI I am working on a major refactor of the MLJMeasures code, which will live in a separate package, which will better leverage MLUtils.jl. I'm considering dropping LossFunctions.jl altogether there (see this issue) and to just re-implement those functions. Given the infrastructure I have developed, this would be pretty simple. I'll also make the basic type-free scalar functions public.