[sr-dev] [kamailio/kamailio] [RFE]: Allow NULL for acc db_extra and multi_leg_info (#2531)

[Anthony Messina]

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### Description

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Just as in #1378, allowing nullable entries for SQL would be appreciated in acc `db_extra` and acc `multi_leg_info`.

### Expected behavior
Empty/NULL values should be inserted with `NULL`.  For example, I can't create a `timestamp without time zone` to be used with multi-leg-accounting as follows.
```
modparam("acc", "multi_leg_info",
        "leg_dst_user=$avp(leg_dst_user);"
        "leg_dst_domain=$avp(leg_dst_domain);"
        "leg_sip_code=$avp(leg_sip_code);"
        "leg_time=$avp(leg_time);"
        "leg_to_tag=$avp(leg_to_tag)")

$avp(leg_time)=$timef(%F %T)

```


#### Actual observed behavior
Emplty/NULL values are inserted with `''` which fails as `''` is invalid input for a `timestamp without time zone` column.

#### Log Messages

<!--
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```
db_postgres [km_dbase.c:266]: db_postgres_submit_query(): 0x7f26f7fb6cc8 PQsendQuery Error: ERROR:  invalid input syntax for type timestamp: ""
```

#### SIP Traffic

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```
(paste your sip traffic here)
```

### Possible Solutions

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### Additional Information

  * **Kamailio Version** - output of `kamailio -v`

```
ersion: kamailio 5.4.1-8.gitd43872c11e.fc32.2 (x86_64/linux) 09fd6a
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: 09fd6a 
compiled on 00:00:00 Oct 22 2020 with gcc 10.2.1
```

* **Operating System**:

<!--
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Kernel details (output of `uname -a`)
-->

```
Linux host 5.8.15-201.fc32.x86_64 #1 SMP Thu Oct 15 15:56:44 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
```


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