Adds sexp and struct writers to the `LazyRawTextWriter_1_0` (#684) #2429

Job	Run time
Build and Test (ubuntu-latest, default)	56s
Build and Test (ubuntu-latest, all)	2m 33s
Build and Test (ubuntu-latest, experimental-ion-hash)	54s
Build and Test (ubuntu-latest, experimental)	1m 43s
Build and Test (windows-2019, default)	3m 7s
Build and Test (windows-2019, all)	4m 0s
Build and Test (windows-2019, experimental-ion-hash)	3m 6s
Build and Test (windows-2019, experimental)	4m 35s
Build and Test (macos-latest, default)	1m 19s
Build and Test (macos-latest, all)	3m 15s
Build and Test (macos-latest, experimental-ion-hash)	1m 51s
Build and Test (macos-latest, experimental)	4m 56s
	32m 15s

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