Add support for dollar count segment in filter

[KenitoInc]

Issues

This pull request fixes issue #xxx.

Description

Add support for the following:

$filter=navProp/$count gt 10
$filter=navProp/$count($filter=prop gt 1) gt 2
$filter = collectionValuedProp/$count gt 10
$filter=collectionValuedProp/$count($filter=prop gt 1) gt 2

Checklist (Uncheck if it is not completed)

• Test cases added
• Build and test with one-click build and test script passed

Additional work necessary

If documentation update is needed, please add "Docs Needed" label to the issue and provide details about the required document change in the issue.

[gathogojr]

Did you cater for $search as well? If yes, maybe you should mention that in the PR description and add a test(s)

[KenitoInc]

$search is not supported in WebAPI.
This code ensures we return the correct query node after adding Parameter alias.

[gathogojr]

Left a few comments, otherwise looks good

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This PR has 35 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       : +34 -1
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Total files changed: 7

Change summary by file extension:
.cs : +31 -1
.bsl : +3 -0

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