fix: builder plain field context accessors

Author: lsafer-meemer

mmrpc-definition/src/commonMain/kotlin/builder/FieldDefinitionBuilder.kt

@@ -31,7 +31,9 @@ context(ctx: FieldDefinitionBuilder)
 val default get() = ctx.default
 
 context(ctx: FieldDefinitionBuilder)
-val key get() = ctx.key
+fun key(value: String) {
+    ctx.key = value
+}
 
 ////////////////////////////////////////
 

mmrpc-definition/src/commonMain/kotlin/builder/TraitDefinitionBuilder.kt

@@ -34,6 +34,11 @@ class TraitDefinitionBuilder :
     }
 }
 
+context(ctx: TraitDefinitionBuilder)
+fun discriminator(value: String) {
+    ctx.discriminator = value
+}
+
 ////////////////////////////////////////
 
 @Marker2

mmrpc-definition/src/commonMain/kotlin/builder/UnionDefinitionBuilder.kt

@@ -35,6 +35,11 @@ class UnionDefinitionBuilder :
     }
 }
 
+context(ctx: UnionDefinitionBuilder)
+fun discriminator(value: String) {
+    ctx.discriminator = value
+}
+
 ////////////////////////////////////////
 
 @Marker2