Batch insert

[baukevdw]

Add support for batch inserts on the connection and query builder

/**
 * @param string $table  The table to insert the given records in
 * @param array[] $rows The rows to insert into the table
 */
public function batchInsert(string $table, array $rows): int

Each row should consist of an key-value array where the key should match the column name.
All the rows should contain the same amount of columns.
The order of the columns doesn't matter (the implementation should sort the keys alphabetically ksort).