feat: add ZBytes.to_bytearray

It allows to avoid a copy if you want to get an additional copy, as
otherwise you would have to first get a `bytes` instance, then create
a bytearray from it.

src/bytes.rs

@@ -53,6 +53,10 @@ impl ZBytes {
         self.0.to_bytes()
     }
 
+    fn to_bytearray<'py>(&self, py: Python<'py>) -> Bound<'py, PyByteArray> {
+        PyByteArray::new_bound(py, &self.0.to_bytes())
+    }
+
     fn to_string(&self) -> PyResult<Cow<str>> {
         self.0
             .try_to_string()

zenoh/__init__.pyi

@@ -989,6 +989,7 @@ class ZBytes:
 
     def __new__(cls, bytes: bytearray | bytes | str = None) -> Self: ...
     def to_bytes(self) -> bytes: ...
+    def to_bytearray(self) -> bytearray: ...
     def to_string(self) -> str: ...
     def __bool__(self) -> bool: ...
     def __len__(self) -> int: ...