feat: add DSL markers to codegenned structure builders #2754

Job	Run time
protocol-tests	9m 25s
all-platforms (ubuntu-latest)	5m 23s
jvm (8)	3m 24s
all-platforms (macos-latest)	7m 16s
downstream	6m 58s
jvm (11)	3m 23s
all-platforms (windows-latest)	7m 32s
jvm (17)	3m 28s
jvm (21)	3m 17s
	50m 6s

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