LightGBM

[ci] move Python Mac jobs from Travis to GitHub Actions (#3745)

* [ci] move Python Mac jobs from Travis to GitHub Actions

* alphabetize

* fix workflow

* fix name

* fix os

* new workflow

* Apply suggestions from code review

Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* changes from code review

* swap compilers

* swap compilers back

* Apply suggestions from code review

Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* Update .github/workflows/python_package.yml

Co-authored-by: Nikita Titov <nekit94-08@mail.ru>