Add examples for Nested JSON reader

[GregoryKimball]

Description

Adding some examples to show off the nested type JSON reading

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[karthikeyann]

rerun tests

[galipremsagar]

rerun tests

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (branch-22.10@5a4afec). Click here to learn what that means.
Patch has no changes to coverable lines.

❗ Current head b0087f0 differs from pull request most recent head 3b6023c. Consider uploading reports for the commit 3b6023c to get more accurate results

Additional details and impacted files

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[galipremsagar]

@gpucibot merge