[BUG][CORE] Use intersection of required fields across anyOf/oneOf members #116

Job	Run time
Build Kotlin server (jdk21) (samples/server/others/kotlin-server/polymorphism-and-discriminator)	1m 39s
Build Kotlin server (jdk21) (samples/server/others/kotlin-springboot/oneOf-enum-discriminator)	1m 49s
Build Kotlin server (jdk21) (samples/server/others/kotlin-springboot/oneOf-discriminator)	1m 54s
Build Kotlin server (jdk21) (samples/server/petstore/kotlin-server/ktor2)	2m 15s
Build Kotlin server (jdk21) (samples/server/petstore/kotlin-misk)	2m 0s
Build Kotlin server (jdk21) (samples/server/petstore/kotlin-server/javalin-6)	1m 55s
Build Kotlin server (jdk21) (samples/server/others/kotlin-springboot/oneOf-discriminator-const)	2m 14s
Build Kotlin server (jdk21) (samples/server/others/kotlin-server/polymorphism-allof-and-discrimin...	1m 50s
Build Kotlin server (jdk21) (samples/server/petstore/kotlin-server-required-and-nullable-properties)	1m 58s
Build Kotlin server (jdk21) (samples/server/others/kotlin-server/polymorphism-and-discriminator-d...	1m 44s
Build Kotlin server (jdk21) (samples/server/others/kotlin-server/polymorphism)	1m 57s
Build Kotlin server (jdk21) (samples/server/petstore/kotlin-server/ktor)	2m 3s
	23m 18s

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