Cache render-fns, fixed invalidation of ViewerFn in postwalk, elisiio… #5271

Job	Run time
build-and-upload-viewer-resources	2m 10s
clj-kondo	12s
test (macos-latest, bash)	4m 8s
test (ubuntu-latest, bash)	1m 17s
test (windows-latest, powershell)	1m 59s
static-build	5m 56s
SSR smoke test build	4m 7s
deploy	27s
ui-tests	1m 56s
	22m 12s

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