feat(Rust): Add option to skip serializing empty optional fields #718

Job	Run time
build	32s
typescript,typescript-zod,typescript-effect-schema	1m 39s
javascript,schema-javascript	55s
golang,schema-golang	1m 8s
cjson,schema-cjson	1m 30s
cplusplus,schema-cplusplus	1m 38s
flow,schema-flow	1m 41s
java,schema-java	1m 38s
python,schema-python	1m 39s
haskell,schema-haskell	1m 42s
csharp,schema-csharp,schema-json-csharp,graphql-csharp,csharp-SystemTextJson	1m 39s
json-ts-csharp	1m 39s
dart,schema-dart	1m 11s
swift,schema-swift	1m 38s
javascript-prop-types	1m 8s
ruby	55s
php	50s
scala3,schema-scala3	1m 38s
rust,schema-rust	1m 37s
kotlin,schema-kotlin,kotlin-jackson,schema-kotlin-jackson	1m 37s
objective-c	1m 15s
test-complete	0s
	29m 9s

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