[sr-dev] [kamailio/kamailio] Wanted HTTP/2 parser (#1794)

[sergey-safarov]

I asynchronously report registration info to application server.
```
loadmodule "jansson.so"
loadmodule "http_async_client.so"
loadmodule "http_client.so"
modparam("http_client", "httpredirect", 0)
modparam("http_client", "useragent", "E-CSCF")
modparam("http_client", "maxdatasize", 64535)
modparam("http_client", "connection_timeout", 2)
modparam("http_client", "tlsversion", 6)
modparam("http_client", "keep_connections", 1)
modparam("http_client", "httpcon", "lisendpoint=>https://example.com/LIS")

# Sending regisration info to LIS server
route[SEND_REGISTRATION_TO_LIS] {
        xlog("L_ALERT","DEBUG: Sending registration info to LIS for $fu\n");
        $var(payload)='{}';
        $var(json_request)='{}';
        jansson_set("string", "call_id", $ci, "$var(payload)");
        jansson_set("integer", "msg_timestamp", $Ts, "$var(payload)");
        jansson_set("integer", "expires", $xavp(ulrcd[0]=>expires), "$var(payload)");
        jansson_set("string", "network_address", $si, "$var(payload)");
        jansson_set("integer", "network_port", $sp, "$var(payload)");
        jansson_set("string", "from", $fu, "$var(payload)");
        jansson_set("string", "user_agent", $ua, "$var(payload)");
        jansson_set("string", "contact", $ct, "$var(payload)");
        jansson_set("obj", "registration_update", "$var(payload)", "$var(json_request)");
        $http_req(suspend) = 0;
        $http_req(hdr) = "Content-Type: application/json";
        $http_req(body) = $var(json_request);

        http_async_query("LIS_URL", "LIS_REPLY");
}

route[LIS_REPLY] {
    if ($http_ok) {
        xlog("L_INFO", "route[HTTP_REPLY]: status $http_rs\n");
        xlog("L_INFO", "route[HTTP_REPLY]: body   $http_rb\n");
    } else {
        xlog("L_INFO", "route[HTTP_REPLY]: error  $http_err)\n");
    }
}
```

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