support expressions in `@for` macro #554

Job	Run time
Julia 1.6 - ubuntu-latest - x64	11m 0s
build	3m 18s
Julia 1.6 - macOS-latest - x64	8m 10s
Julia 1.6 - windows-latest - x64	17m 0s
Julia 1.7 - ubuntu-latest - x64	9m 42s
Julia 1.7 - macOS-latest - x64	3m 2s
Julia 1.7 - windows-latest - x64	5m 19s
Julia nightly - ubuntu-latest - x64	8m 1s
Julia nightly - macOS-latest - x64	9m 35s
Julia nightly - windows-latest - x64	13m 57s
	1h 29m 4s

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