New rule: Favour Nested Functions #1853

Job	Run time
buildAndTest (ubuntu-latest)	39s
buildAndTest (windows-latest)	43s
buildAndTest (macOS-latest)	37s
testReleaseBinariesInDotNet8Container	0s
packReleaseBinaries	0s
testReleaseBinariesWithDotNet10	0s
publishReleaseBinaries	0s
deployReleaseDocs	-1s
	1m 58s

Provide feedback