[sr-dev] [kamailio/kamailio] core: logging: JSON: add CEE schema support (#2826)

[Daniel Pocock]

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#### Type Of Change
- [ ] Small bug fix (non-breaking change which fixes an issue)
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#### Checklist:
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- [x] PR should be backported to stable branches
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- [x] Related to issue #2797 (replace XXXX with an open issue number)

#### Description
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See the feature request in #2797 

I've provided similar implementation in reSIProcate binaries, Kurento and GStreamer pull requests so they can all share the identical CEE schema.

Tested like this:

```
make

src/kamailio -f ./misc/examples/ims/pcscf/kamailio.cfg --log-engine=json:U -D -dddd -E
```

I copied one of the JSON log lines to a file and parsed it like this to check it is valid JSON:

```
python -m json.tool /tmp/kamailio.json 
{
    "appname": "kamailio",
    "file!line": 97,
    "file!name": "core/mem/pkg.c",
    "hostname": "ws.example.org",
    "msg": "destroying memory manager: q_malloc\n",
    "native!function": "pkg_destroy_manager",
    "pname": "kamailio",
    "pri": "DEBUG",
    "proc!id": "16264",
    "proc!tid": 140525261209856,
    "subsys": "core",
    "time": "2021-08-16T19:04:43.641230480Z"
}
```
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2826

-- Commit Summary --

  * core: logging: JSON: add CEE schema support

-- File Changes --

    M src/core/dprint.c (58)
    M src/core/dprint.h (3)
    M src/main.c (4)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2826.patch
https://github.com/kamailio/kamailio/pull/2826.diff

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