feat: Add take_data() to all primitive object types.

That is the new, most direct way to obtain its data which otherwise
is immovable.

gix/src/object/blob.rs

@@ -165,4 +165,11 @@ impl Blob<'_> {
     pub fn detach(self) -> ObjectDetached {
         self.into()
     }
+
+    /// Retrieve this instance's data, leaving its own data empty.
+    ///
+    /// This method works around the immovability of members of this type.
+    pub fn take_data(&mut self) -> Vec<u8> {
+        std::mem::take(&mut self.data)
+    }
 }

gix/src/object/commit.rs

@@ -35,6 +35,13 @@ impl<'repo> Commit<'repo> {
     pub fn detach(self) -> ObjectDetached {
         self.into()
     }
+
+    /// Retrieve this instance's encoded data, leaving its own data empty.
+    ///
+    /// This method works around the immovability of members of this type.
+    pub fn take_data(&mut self) -> Vec<u8> {
+        std::mem::take(&mut self.data)
+    }
 }
 
 impl<'repo> Commit<'repo> {

gix/src/object/tag.rs

@@ -40,4 +40,11 @@ impl Tag<'_> {
     pub fn detach(self) -> ObjectDetached {
         self.into()
     }
+
+    /// Retrieve this instance's encoded data, leaving its own data empty.
+    ///
+    /// This method works around the immovability of members of this type.
+    pub fn take_data(&mut self) -> Vec<u8> {
+        std::mem::take(&mut self.data)
+    }
 }

gix/src/object/tree/mod.rs

@@ -266,4 +266,11 @@ impl Tree<'_> {
     pub fn detach(self) -> ObjectDetached {
         self.into()
     }
+
+    /// Retrieve this instance's encoded data, leaving its own data empty.
+    ///
+    /// This method works around the immovability of members of this type.
+    pub fn take_data(&mut self) -> Vec<u8> {
+        std::mem::take(&mut self.data)
+    }
 }