[BUG][CORE] Use intersection of required fields across anyOf/oneOf members #114

Job	Run time
Build Kotlin server (jdk21) (samples/server/others/kotlin-springboot/oneOf-discriminator)	1m 53s
Build Kotlin server (jdk21) (samples/server/others/kotlin-springboot/oneOf-discriminator-const)	2m 7s
Build Kotlin server (jdk21) (samples/server/others/kotlin-server/polymorphism-and-discriminator-d...	1m 37s
Build Kotlin server (jdk21) (samples/server/petstore/kotlin-misk)	1m 48s
Build Kotlin server (jdk21) (samples/server/petstore/kotlin-server/ktor)	2m 4s
Build Kotlin server (jdk21) (samples/server/others/kotlin-server/polymorphism-and-discriminator)	1m 56s
Build Kotlin server (jdk21) (samples/server/petstore/kotlin-server-required-and-nullable-properties)	2m 1s
Build Kotlin server (jdk21) (samples/server/petstore/kotlin-server/ktor2)	2m 12s
Build Kotlin server (jdk21) (samples/server/others/kotlin-server/polymorphism)	1m 51s
Build Kotlin server (jdk21) (samples/server/petstore/kotlin-server/javalin-6)	1m 55s
Build Kotlin server (jdk21) (samples/server/others/kotlin-springboot/oneOf-enum-discriminator)	2m 1s
Build Kotlin server (jdk21) (samples/server/others/kotlin-server/polymorphism-allof-and-discrimin...	1m 47s
	23m 12s

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