Implement a proper request tokenizer

src/commands/queue/plchanges.rs

@@ -2,6 +2,7 @@ use serde::{Deserialize, Serialize};
 
 use crate::{
     Request,
+    request_tokenizer::RequestTokenizer,
     commands::{
         Command, RequestParserError, RequestParserResult, ResponseAttributes, ResponseParserError,
     },
@@ -28,7 +29,7 @@ impl Command for PlChanges {
         }
     }
 
-    fn parse_request(mut parts: std::str::SplitWhitespace<'_>) -> RequestParserResult<'_> {
+    fn parse_request(mut parts: RequestTokenizer<'_>) -> RequestParserResult<'_> {
         let version = parts.next().ok_or(RequestParserError::UnexpectedEOF)?;
         let version = version
             .parse()