support flexgrid kwargs for all element functions #323

Job	Run time
build	2m 36s
Julia 1.6 - ubuntu-latest - x64	3m 42s
Julia 1.6 - macOS-latest - x64	3m 58s
Julia 1.6 - windows-latest - x64	8m 18s
Julia 1.7 - ubuntu-latest - x64	3m 57s
Julia 1.7 - macOS-latest - x64	5m 18s
Julia 1.7 - windows-latest - x64	7m 39s
Julia nightly - ubuntu-latest - x64	3m 3s
Julia nightly - macOS-latest - x64	3m 51s
Julia nightly - windows-latest - x64	6m 15s
	48m 37s

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