Add data projection support to scatterplot widget OpenAPI spec #17516

Job	Run time
examples / examples	2m 31s
test / test (3.2, ubuntu-latest)	1m 31s
pre-commit / pre-commit	1m 8s
test / test (2.7, ubuntu-latest)	1m 48s
test / test (jruby-9.4.12.0, ubuntu-latest)	3m 24s
report	8s
	10m 30s

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