Add support of NSAPI_ICMP sockets in Nanostack

[YannCharbon]

Summary of changes

The Nanostack C++ API only provides UDP and TCP sockets although the socket API fully supports UDP, TCP and ICMP RAW. As it can be useful for a user to be able to easily exchange raw ICMP packets, this PR adds support of NSAPI_ICMP sockets in the Nanostack C++ API.

Impact of changes

Migration actions required

Documentation

Updated related documentation in code.

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Pull request type

[x] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] 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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[0xc0170]

CI started

[mbed-ci]

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