Extract BufferedDM/SV/MPS from ActOnDM/SV/MPSArgs (#4979)

* Extract BufferedDensityMatrix from ActOnDensityMatrixArgs

* state vector

* clean up code

* clean up code

* clean up code

* format

* docs

* test

* coverage

* improve state vector

* improve state vector

* replace deleted functions

* replace deleted functions

* replace deleted functions

* replace deleted functions

* lint

* mps quantum state

* mps quantum state

* mps quantum state

* mps quantum state

* mps quantum state

* mps quantum state

* mps quantum state

* mps quantum state

* coverage

* fix merge errors

* Code review comments

* Remove todo

Co-authored-by: Orion Martin <[email protected]>

Author: daxfohl

cirq-core/cirq/contrib/quimb/mps_simulator.py

@@ -569,3 +569,17 @@ def test_act_on_gate():
         args.state_vector().reshape((2, 2, 2)),
         cirq.one_hot(index=(0, 1, 0), shape=(2, 2, 2), dtype=np.complex64),
     )
+
+
+def test_deprectated():
+    q0 = cirq.LineQubit(0)
+    prng = np.random.RandomState(0)
+    args = ccq.mps_simulator.MPSState(
+        qubits=cirq.LineQubit.range(3),
+        prng=prng,
+        log_of_measurement_results={},
+    )
+    with cirq.testing.assert_deprecated(deadline='0.15'):
+        args.perform_measurement([q0], prng)
+    with cirq.testing.assert_deprecated(deadline='0.15'):
+        args.apply_op(cirq.X(q0), prng)

cirq-core/cirq/contrib/quimb/mps_simulator_test.py

@@ -85,6 +85,7 @@
         'ActOnArgsContainer',
         'ActOnCliffordTableauArgs',
         'ActOnDensityMatrixArgs',
+        'ActOnStabilizerArgs',
         'ActOnStabilizerCHFormArgs',
         'ActOnStateVectorArgs',
         'ApplyChannelArgs',