Add API to get Wi-SUN Neighbor Table

[debdeep-arm]

Summary of changes

Added nbr_info_get API to get Wi-SUN neighbor table information in mbed-mesh-api.
mesh_nw_statistics_t structure in mbed-mesh-api has been updated with more statistics of the Wi-SUN interface.

This is upstream of PR#14586

Impact of changes

Migration actions required

Documentation

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Pull request type

[] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[X] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

[] No Tests required for this change (E.g docs only update)
[X] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

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Reviewers

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@artokin

[ciarmcom]

@debdeep-arm, thank you for your changes.
@artokin @ARMmbed/mbed-os-mesh @ARMmbed/mbed-os-maintainers please review.

[ciarmcom]

This pull request has automatically been marked as stale because it has had no recent activity. @artokin, @ARMmbed/mbed-os-maintainers, @ARMmbed/mbed-os-mesh, please complete review of the changes to move the PR forward. Thank you for your contributions.

[0xc0170]

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[0xc0170]

@debdeep-arm As this is adding new functionality, can you add more details for

Added API to get Wi-SUN neighbor table.
Added more parameters in Wi-SUN statistics.

This will be in the release notes, it would be better with more details. what parameters are being added? What api added?

[debdeep-arm]

@debdeep-arm As this is adding new functionality, can you add more details for

Added API to get Wi-SUN neighbor table.
Added more parameters in Wi-SUN statistics.

This will be in the release notes, it would be better with more details. what parameters are being added? What api added?

I have updated the summery. Please let me know if I need to give more details.
Thank you.

[0xc0170]

Thanks