exposing DataServiceActionQuery<T> properties for testing purposes

[corranrogue9]

Issues

This pull request fixes #2841.

Description

Exposing two properties on DataServiceActionQuery<T> to facilitate testing

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This PR has 31 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Label      : Extra Small
Size       : +23 -8
Percentile : 12.4%

Total files changed: 5

Change summary by file extension:
.cs : +15 -8
.txt : +4 -0
.bsl : +4 -0

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[habbes]

I assume this is done so that the user does not modify the array. But it seems excessive to me, especially given that we do not seem modify the list internally. I think by the time they're casting it back into array to try and modify it, they're already assuming any risks that come with that. But if we really want to prevent that, then maybe it's better to hand them a ReadOnlyCollection that's computed once so we don't have to generate the enumerable each time the property is accessed.