Add an option for encoding scalars with newlines to Emitter.Options #324

Job	Run time
Linux (5.4)	34s
Linux (5.5)	34s
Linux (5.6)	29s
Windows (swift-5.6.3-release, 5.6.3-RELEASE)	5m 7s
Linux (5.7)	34s
Linux (5.8)	37s
Windows (swift-5.7.2-release, 5.7.2-RELEASE)	3m 20s
Linux (5.9)	35s
Windows (development, DEVELOPMENT-SNAPSHOT-2021-11-20-a)	5m 13s
Xcode (12.5.1)	1m 14s
Xcode_Monterey (13.3.1)	36s
Linux (5.10)	35s
Xcode (13.0)	1m 26s
Xcode_Monterey (13.4)	35s
Xcode_Monterey (14.0.1)	48s
Xcode (13.1)	1m 26s
Xcode_Monterey (14.1)	3s
Xcode (13.2.1)	1m 14s
Xcode_Monterey (14.2)	7s
Xcode_Ventura (14.3)	1m 15s
Xcode_Ventura (15.0)	1m 20s
	27m 42s

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