[sr-dev] [kamailio/kamailio] pv: adding xavp_copy (#2070)

[Julien Chavanton]

I am assuming access to XAVP is synchronized as part of the transaction.

Even if this maybe off topic I am just making sure this assumption is safe.
I am looking at the TM module to make sure I understand how the multi replies are synchronized.
I can see in the TM module that the post callback is "releasing the transaction" by decrement the ref_count 
```
register_script_cb( w_t_unref, POST_SCRIPT_CB|REQUEST_CB, 0)<0 )
```
I do not yet found the check to lock / delay parallel execution of replies.
```
register_script_cb( script_init, PRE_SCRIPT_CB|REQUEST_CB , 0)
```

I am need a bit more time to make sure everything is safe.

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