[Refactor] Back OperationalSpaceController with Newton's operational-space controller

source/isaaclab/changelog.d/jichuanh-newton-operational-space-controller.minor.rst

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+Changed
+^^^^^^^
+
+* Changed :class:`~isaaclab.controllers.OperationalSpaceController` to evaluate its task-space
+  impedance, contact-wrench and null-space laws through Newton's model-free operational-space
+  controller (:class:`newton.controllers.ControllerOperationalSpaceModelFree`), preserving its
+  public configuration, command, and output contracts. The task frame is now handed to Newton as
+  the operational frame, so gains, selection axes and targets stay expressed in it instead of being
+  rotated into the root frame first. Solves now use float32 internal buffers.
+
+Fixed
+^^^^^
+
+* Fixed the ``variable_kp`` impedance mode rebinding the motion damping-gain buffer instead of
+  writing it in place, which left previously captured references, such as the LeApp export
+  annotator's gain tensors, reading a stale buffer.