[sr-dev] [kamailio/kamailio] core websocket close event (#2397)

[lazedo]

#### Pre-Submission Checklist
- [X] Commit message has the format required by CONTRIBUTING guide
- [X] Commits are split per component (core, individual modules, libs, utils, ...)
- [X] Each component has a single commit (if not, squash them into one commit)
- [X] No commits to README files for modules (changes must be done to docbook files
in `doc/` subfolder, the README file is autogenerated)

#### Type Of Change
- [ ] Small bug fix (non-breaking change which fixes an issue)
- [X] New feature (non-breaking change which adds new functionality)
- [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist:
- [ ] PR should be backported to stable branches
- [X] Tested changes locally
- [ ] Related to issue #XXXX (replace XXXX with an open issue number)

#### Description
allow kamailio modules to be notified when a websocket is closed without depending on script callbacks.
this allows for multiple independent modules to subscribe to new core event `SREV_TCP_WS_CLOSE`
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2397

-- Commit Summary --

  * core: add websocket event
  * websocket: emit core event on close

-- File Changes --

    M src/core/events.c (20)
    M src/core/events.h (2)
    M src/modules/websocket/ws_conn.c (21)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2397.patch
https://github.com/kamailio/kamailio/pull/2397.diff

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