Deprecated old argument and suggestion-related classes

Marked `WrappedArgumentType`, `ResultConverter`, and `SuggestionProvider` as `@Deprecated` for removal in 2.3.0. Provided migration references for their replacements in the Javadocs.

Author: NonSwag

paper/src/main/java/core/paper/command/ResultConverter.java

@@ -2,16 +2,19 @@
 
 import com.mojang.brigadier.StringReader;
 import com.mojang.brigadier.exceptions.CommandSyntaxException;
+import io.papermc.paper.command.brigadier.argument.CustomArgumentType;
 import org.jspecify.annotations.NullMarked;
 
 /**
  * Represents a functional interface for converting a value of type T to a value of type R.
  *
  * @param <T> the type of the input value
  * @param <R> the type of the converted value
+ * @deprecated use {@link CustomArgumentType.Converted#convert(Object)}
  */
 @NullMarked
 @FunctionalInterface
+@Deprecated(forRemoval = true, since = "2.3.0")
 public interface ResultConverter<T, R> {
     /**
      * Converts a value of type T to a value of type R.

paper/src/main/java/core/paper/command/SuggestionProvider.java

@@ -9,9 +9,12 @@
 
 /**
  * Functional interface for providing suggestions for command arguments.
+ *
+ * @deprecated use {@link com.mojang.brigadier.suggestion.SuggestionProvider}
  */
 @NullMarked
 @FunctionalInterface
+@Deprecated(forRemoval = true, since = "2.3.0")
 public interface SuggestionProvider {
     /**
      * Provides suggestions for command arguments.

paper/src/main/java/core/paper/command/WrappedArgumentType.java

@@ -17,8 +17,10 @@
  *
  * @param <T> the type of the native ArgumentType
  * @param <V> the type of the parsed value after conversion
+ * @deprecated use {@link CustomArgumentType.Converted}
  */
 @NullMarked
+@Deprecated(forRemoval = true, since = "2.3.0")
 public class WrappedArgumentType<T, V> implements CustomArgumentType<V, T> {
     private final ArgumentType<T> nativeType;
     private final ResultConverter<T, V> converter;