implement basic type annotations (not yet used or declarable)

ffi/src/main/kotlin/gay/pizza/pork/ffi/FfiNativeProvider.kt

@@ -118,7 +118,7 @@ class FfiNativeProvider : ExpandedNativeProvider, NativeProvider {
     val buffer = HeapInvocationBuffer(context)
 
     val useFunctionArguments = functionArgumentSpecs ?: functionArguments.map {
-      ArgumentSpec(symbol = Symbol(""), multiple = false)
+      ArgumentSpec(symbol = Symbol(""), typeSpec = null, multiple = false)
     }
 
     for ((index, spec) in useFunctionArguments.withIndex()) {

ffi/src/main/kotlin/gay/pizza/pork/ffi/JavaAutogen.kt

@@ -147,11 +147,13 @@ class JavaAutogen(val javaClass: Class<*>) {
       arguments = parameterNames.map {
         ArgumentSpec(
           symbol = Symbol(it),
-          multiple = false
+          multiple = false,
+          typeSpec = null,
         )
       },
       nativeFunctionDescriptor = asNative(functionDefinition),
-      block = null
+      block = null,
+      returnType = null,
     )
 
   private fun asNative(functionDefinition: JavaFunctionDefinition): NativeFunctionDescriptor =