Qpy 0.21 updates (#409)

* Copy Qiskit/qiskit#8055

Co-authored-by: Matthew Treinish <mtreinish@kortar.org>

* Copy qpy changes from Qiskit/qiskit#8093

Co-authored-by: Jake Lishman <jake@binhbar.com>
Co-authored-by: Jake Lishman <jake.lishman@ibm.com>

* Copy Qiskit/qiskit#8200

Co-authored-by: Matthew Treinish <mtreinish@kortar.org>

* Copy of Qiskit/qiskit#7300

Co-authored-by: Matthew Treinish <mtreinish@kortar.org>
Co-authored-by: Naoki Kanazawa <nkanazawa1989@gmail.com>

* Copy of Qiskit/qiskit#8235

Co-authored-by: Matthew Treinish <mtreinish@kortar.org>

Co-authored-by: Matthew Treinish <mtreinish@kortar.org>
Co-authored-by: Jake Lishman <jake@binhbar.com>
Co-authored-by: Jake Lishman <jake.lishman@ibm.com>
Co-authored-by: Naoki Kanazawa <nkanazawa1989@gmail.com>

qiskit_ibm_runtime/qpy/__init__.py

@@ -31,18 +31,18 @@
 For example::
 
     from qiskit.circuit import QuantumCircuit
-    from qiskit.circuit import qpy_serialization
+    from qiskit import qpy
 
     qc = QuantumCircuit(2, name='Bell', metadata={'test': True})
     qc.h(0)
     qc.cx(0, 1)
     qc.measure_all()
 
     with open('bell.qpy', 'wb') as fd:
-        qpy_serialization.dump(qc, fd)
+        qpy.dump(qc, fd)
 
     with open('bell.qpy', 'rb') as fd:
-        new_qc = qpy_serialization.load(fd)[0]
+        new_qc = qpy.load(fd)[0]
 
 API documentation
 =================

qiskit_ibm_runtime/qpy/binary_io/__init__.py

@@ -15,6 +15,8 @@
 from .value import (
     dumps_value,
     loads_value,
+    write_value,
+    read_value,
     # for backward compatibility; provider, runtime, experiment call this private methods.
     _write_parameter,
     _write_parameter_expression,
@@ -30,3 +32,7 @@
     _write_instruction,
     _read_instruction,
 )
+from .schedules import (
+    write_schedule_block,
+    read_schedule_block,
+)