Add {"_extension_version": MYSQLND_AZURE_VERSION} to connection attr

[coko156]

Add a connection attribute "_extension_version" : "mysqlnd_azure-x.x.x", e.x. "_extension_version": "mysqlnd_azure-1.1.1".

mysqlnd_azure.h: MYSQLND_AZURE_VERSION variable should be changed if you want to make a new version number.

How to get this variable:

select * from performance_schema.session_account_connect_attrs; can show what attrs set for current session.

[hzhang87]

Seems good to me. It will be good if we can have a build and test against GW.

[GuuBu]

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[GuuBu]

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