Add a thread safe dictionary API

Description

Actual Dictionary implementation is not thread safe. Develop a new API implementing thread safe dictionary.

Detailed description

This new API should work as the actual dictionary implementation and warranty concurent access between threads.

Code version identification

sha1: 789a297a

Security impact

N.A

Implementation

Write a new module sopc_tsafe_dict.h which lock and unlock a mutex around sopc_dict.h API calls.

Known limitations

Edited by Gael Raphal
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