[sr-dev] [kamailio/kamailio] Cannot use db_flatstore with siptrace module (#1850)

[Chris Ayoup]

### Description

The siptrace module attempts to do a query to check the schema version on startup, however 

### Troubleshooting

#### Reproduction

Load `siptrace` and `db_flatstore` modules and set siptrace `db_url` to a `flatstore:` url.  siptrace will fail to load due to the inability to query for the table version.

### Possible Solutions

Since siptrace module only writes data and never reads, it can safely skip the schema version check if the db driver doesn't expose `DB_CAP_QUERY` or `DB_CAP_RAW_QUERY` capabilities.  This might apply to other "write only" modules as well but I haven't checked.


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