[sr-dev] [kamailio/kamailio] Add HEPv3 support to siptrace (#1006)

[Giacomo Vacca]

This PR allows kamailio to duplicate messages to Homer using HEPv3 [0].
An optional correlation ID (which can contain PVs) can be passed to `sip_trace()`.

The packing macros in hep.h are authored by @camilleoudot and I've just used them.

An example of formats:

```
modparam("siptrace", "duplicate_uri", "sip:127.0.0.1:9062")
...
sip_trace("sip:127.0.0.1:9060", "123"); // duplicate URI + correlation ID
sip_trace("", "345"); // default URI + correlation ID
sip_trace("", "$fU-678"); // default URI + correlation ID with PVs
sip_trace(); // default URI + no correlation ID
```

[0] https://github.com/sipcapture/HEP/blob/master/docs/HEP3_rev12.pdf
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/1006

-- Commit Summary --

  * sipcapture: add macros to pack HEPv3 chunks
  * siptrace: add support for HEPv3
  * siptrace: update doc with support for HEPv3
  * siptrace: update doc with editor

-- File Changes --

    M src/modules/sipcapture/hep.h (47)
    M src/modules/siptrace/doc/siptrace.xml (5)
    M src/modules/siptrace/doc/siptrace_admin.xml (60)
    M src/modules/siptrace/siptrace.c (321)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1006.patch
https://github.com/kamailio/kamailio/pull/1006.diff

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