Add a `Types.jl` to define all types #595

Job	Run time
Documentation	5m 58s
test (1.6, stable, ubuntu-latest)	3m 44s
test (1.6, devel, ubuntu-latest)	5m 48s
test (1.6, 1.1, ubuntu-latest)	3m 4s
test (1.10, stable, ubuntu-latest)	4m 10s
test (1.10, devel, ubuntu-latest)	5m 57s
test (1.10, 1.1, ubuntu-latest)	2m 13s
test (1.11, stable, ubuntu-latest)	5m 59s
test (1.11, devel, ubuntu-latest)	5m 59s
test (1.11, 1.1, ubuntu-latest)	3m 19s
test (nightly, stable, ubuntu-latest)	2m 33s
test (nightly, devel, ubuntu-latest)	2m 53s
	51m 37s

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