Move v21 wallet module into subdirectory

In preparation for adding v21 wallet RPCs move the module into a
subdirectory and split out the into module.

Move only, no code changes.

Author: jamillambert

types/src/v21/wallet/into.rs

@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: CC0-1.0
+
+use super::UnloadWallet;
+use crate::model;
+
+impl UnloadWallet {
+    /// Converts version specific type to a version nonspecific, more strongly typed type.
+    pub fn into_model(self) -> model::UnloadWallet {
+        model::UnloadWallet { warnings: vec![self.warning] }
+    }
+}

types/src/v21/wallet.rs renamed to types/src/v21/wallet/mod.rs

@@ -4,9 +4,9 @@
 //!
 //! Types for methods found under the `== Wallet ==` section of the API docs.
 
-use serde::{Deserialize, Serialize};
+mod into;
 
-use crate::model;
+use serde::{Deserialize, Serialize};
 
 /// Result of the JSON-RPC method `unloadwallet`.
 ///
@@ -20,10 +20,3 @@ pub struct UnloadWallet {
     /// Warning messages, if any, related to unloading the wallet.
     pub warning: String,
 }
-
-impl UnloadWallet {
-    /// Converts version specific type to a version nonspecific, more strongly typed type.
-    pub fn into_model(self) -> model::UnloadWallet {
-        model::UnloadWallet { warnings: vec![self.warning] }
-    }
-}