Add support for dot in sprintf format. (#1146) #1748

Job	Run time
Build on windows-latest for repo global.json	20m 9s
Build on windows-latest for 6.0 stable	18m 3s
Build on windows-latest for 7.0 preview	18m 36s
Build on macos-latest for repo global.json	23m 25s
Build on macos-latest for 6.0 stable	22m 19s
Build on macos-latest for 7.0 preview	26m 11s
Build on ubuntu-latest for repo global.json	15m 5s
Build on ubuntu-latest for 6.0 stable	13m 43s
Build on ubuntu-latest for 7.0 preview	17m 50s
	2h 55m 21s

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