C# add keep property name options #720

Job	Run time
build	29s
typescript,typescript-zod,typescript-effect-schema	1m 40s
javascript,schema-javascript	1m 1s
golang,schema-golang	1m 9s
cjson,schema-cjson	1m 39s
cplusplus,schema-cplusplus	1m 38s
flow,schema-flow	1m 39s
java,schema-java	1m 41s
python,schema-python	1m 38s
haskell,schema-haskell	1m 39s
csharp,schema-csharp,schema-json-csharp,graphql-csharp,csharp-SystemTextJson	1m 41s
json-ts-csharp	1m 39s
dart,schema-dart	1m 17s
swift,schema-swift	1m 39s
javascript-prop-types	1m 15s
ruby	55s
php	1m 0s
scala3,schema-scala3	1m 44s
rust,schema-rust	1m 34s
kotlin,schema-kotlin,kotlin-jackson,schema-kotlin-jackson	1m 37s
objective-c	1m 16s
test-complete	0s
	29m 50s

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