Add support for $count segments within $expand

[KenitoInc]

Issues

This pull request fixes issue #xxx.

Description

Briefly describe the changes of this pull request.

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.

[pull-request-quantifier-deprecated]

This PR has 101 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Quantification details

Label      : Medium
Size       : +94 -7
Percentile : 40.2%

Total files changed: 6

Change summary by file extension:
.cs : +94 -7

Change counts above are quantified counts, based on the PullRequestQuantifier customizations.

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