Add number aggregates to date{time}s. Move examples to repo. #1410

Job	Run time
initialize	5s
build_pyodide (ubuntu-20.04)	27m 31s
build_js (ubuntu-20.04, 3.9, 18.x)	15m 41s
lint_python (ubuntu-20.04, 3.9)	4m 4s
build_python (ubuntu-20.04, 3.9, 2014, 18.x, false, false)	31m 40s
test_js (ubuntu-20.04, 3.9, 18.x)	11m 52s
benchmark_js	0s
test_js_and_python (ubuntu-20.04, 3.9, 18.x)	5m 21s
test_python (ubuntu-20.04, 3.9, 18.x, false, false)	5m 17s
benchmark_python	0s
test_python_sdist	0s
publish	0s
	1h 41m 31s

Provide feedback