SMW::SQLStore::Installer::BeforeCreateTablesComplete

Adding primary keys

Demonstrates how to add primary keys ([#3559][issue-3559]) to Semantic MediaWiki table definitions.

```php use Hooks;

Hooks::register( 'SMW::SQLStore::Installer::BeforeCreateTablesComplete', function( array $tables, $messageReporter ) {

// #3559
// Incomplete list to only showcase how to modify the table definition
$primaryKeys = [
    'smw_di_blob'     => 'p_id,s_id,o_hash',
    'smw_di_bool'     => 'p_id,s_id,o_value',
    'smw_di_uri'      => 'p_id,s_id,o_serialized',
    'smw_di_coords'   => 'p_id,s_id,o_serialized',
    'smw_di_wikipage' => 'p_id,s_id,o_id',
    'smw_di_number'   => 'p_id,s_id,o_serialized',

    // smw_fpt ...

    'smw_prop_stats'  => 'p_id',
    'smw_query_links' => 's_id,o_id'
];

/**
 *