Loki: Re-introduce `enable_imports` in scheduler config #283

Job	Run time
ci (Release, linux gnu-10)	43s
ci (Release, linux clang-12)	34s
ci (Release, linux intel-classic)	2m 48s
ci (Release, macos)	31m 58s
ci (linux nvhpc-21.9, ubuntu-20.04, nvhpc-21.9, nvc, nvc++, nvfortran, -DCMAKE_CXX_FLAGS=--diag_s...	2m 30s
	38m 33s

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