extract factory for json annotations, added missing file

Author: hauner

openapi-processor-core/src/main/kotlin/io/openapiprocessor/core/writer/java/JsonAnnotationFactory.kt

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2026 https://github.com/openapi-processor/openapi-processor-base
+ * PDX-License-Identifier: Apache-2.0
+ */
+
+package io.openapiprocessor.core.writer.java
+
+import io.openapiprocessor.core.model.Annotation
+import io.openapiprocessor.core.model.datatypes.PropertyDataType
+
+interface JsonAnnotationFactory {
+    @Deprecated(message = "use methods")
+    val jsonProperty: Annotation
+    val jsonCreator: Annotation
+    val jsonValue: Annotation
+
+    /** get property annotations imports */
+    fun createPropertyImports(propDataType: PropertyDataType): Collection<String>
+    /** get property annotations */
+    fun createPropertyAnnotations(propertyName: String, propDataType: PropertyDataType): Collection<String>
+}