LightGBM

[ci] added swig compilation on macOS and Windows with artifacts (#2170)

* compile SWIG artifact on Windows

* compile SWIG artifact on Windows

* combined swig and sdist jobs for Linux

* added conditions for artifacts publishing

* added SWIG artifact compilation on macOS

* hotfix

* test: switch compilers

* harsh workaround for OpenMP library conflict

* switch compilers back

* consistent order of tasks in condition

* dummy commit to trigger CI and fix CLA