feat: set data_range as a property (#6788)

Fixes #6441 

### Description

Creates a setter method for `data_range` by setting it as a property
using the **`@property`** decorator.

### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [ ] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [ ] Quick tests passed locally by running `./runtests.sh --quick
--unittests --disttests`.
- [ ] In-line docstrings updated.
- [ ] Documentation updated, tested `make html` command in the `docs/`
folder.

Signed-off-by: Saurav Maheshkar <[email protected]>

monai/losses/ssim_loss.py

@@ -61,7 +61,7 @@ def __init__(
         """
         super().__init__(reduction=LossReduction(reduction).value)
         self.spatial_dims = spatial_dims
-        self.data_range = data_range
+        self._data_range = data_range
         self.kernel_type = kernel_type
 
         if not isinstance(win_size, Sequence):
@@ -77,14 +77,23 @@ def __init__(
 
         self.ssim_metric = SSIMMetric(
             spatial_dims=self.spatial_dims,
-            data_range=self.data_range,
+            data_range=self._data_range,
             kernel_type=self.kernel_type,
             win_size=self.kernel_size,
             kernel_sigma=self.kernel_sigma,
             k1=self.k1,
             k2=self.k2,
         )
 
+    @property
+    def data_range(self) -> float:
+        return self._data_range
+
+    @data_range.setter
+    def data_range(self, value: float) -> None:
+        self._data_range = value
+        self.ssim_metric.data_range = value
+
     def forward(self, input: torch.Tensor, target: torch.Tensor) -> torch.Tensor:
         """
         Args: