Add a way for server and client context to directly return peer IP.

[mmoanis]

The proposed change for #5693

A new struct PeerInfo is added to contain the peer information. Filling this struct exploit the fact that the peer's URI is always in the form PROTOCOL:IP:PORT

Since the issue is related to only the C++ API, I made the changes in it only.

Finally, I am not sure if this solves the problem of 'without string parsing' but though it is better to make the PR and discuss that. Also, the parsing of the URI may need to be in the struct CTOR.

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[mmoanis]

CLA signed.

[yang-g]

Thanks for the pull request.
The PR is not in the form that I am willing to accept because it is changing existing public API.

Considering

• the availability of 3rd party libraries for parsing uri and
• that implementation of string parsing function (as shown in this PR) is simple

I do not think we need this as part of grpc library at the moment.