Move object marshalers to be value type based

[manodasanW]

Today, when marshaling a reference type, we allocate an IObjectReference to hold onto the ptr which is a heap allocation and needs to also be garbage collected later. This moves to instead using a value type to hold onto it as we use the ptr and dispose of it immediately in marshaling scenarios and don't need to change threads / contexts.

• Achieved by adding a new CreateMarshaler2 function which returns an ObjectReferenceValue
• Made further use of it in FromManaged and CopyManaged scenarios where the IObjectReference we allocated was even more temporary as they are used to return a ptr to the ABI.
• This change doesn't change generic marshalers which I will look at if it is possible to address in a future PR.

Slower	diff/base	Base Median (ns)	Diff Median (ns)	Modality
Benchmarks.QueryInterfacePerf.QueryNonDefaultInterfaceSetProperty	1.26	9.46	11.91
Benchmarks.QueryInterfacePerf.QuerySDKDefaultInterface	1.13	32.67	37.08
Benchmarks.QueryInterfacePerf.QueryFastAbiDerivedDefaultInterface	1.08	11.99	12.98

Faster	base/diff	Base Median (ns)	Diff Median (ns)	Modality
Benchmarks.ReflectionPerf.SetNullableIntDelegate	1.79	980.04	549.00
Benchmarks.ReflectionPerf.SetNullableNonBittableStruct	1.49	2640.33	1773.59
Benchmarks.QueryInterfacePerf.QueryInterfaceOnManagedObject	1.46	348.97	239.73
Benchmarks.ReflectionPerf.SetNullableBittableStruct	1.43	2243.38	1572.90
Benchmarks.QueryInterfacePerf.QueryNativeInterfaceOnComposedObject	1.33	530.61	398.11
Benchmarks.EventPerf.InvokeNativeIntEvent	1.18	860.37	726.61
Benchmarks.ReflectionPerf.IntEventSource	1.16	20921.35	18074.39
Benchmarks.ReflectionPerf.SetUri	1.14	850.08	748.12
Benchmarks.EventPerf.NativeIntEventOverhead	1.10	3732.42	3377.95
Benchmarks.EventPerf.AddAndInvokeNativeIntEventOnNewEventSource	1.10	9210.24	8362.42
Benchmarks.QueryInterfacePerf.DefaultObjectParameters	1.08	1885.35	1744.03
Benchmarks.ReflectionPerf.SetNullableDelegate	1.07	1510.05	1405.92
Benchmarks.EventPerf.AddNativeIntEventToNewEventSource	1.07	7692.39	7186.65
Benchmarks.ReflectionPerf.SetNullableInt	1.07	1699.05	1592.17
Benchmarks.ReflectionPerf.GetNullableTimeSpan	1.06	2267.30	2137.38