Add sslcert and sslrootcert to PgSQL\Connection and fix a small bug

[mesour]

• Add sslcert and sslrootcert to PgSQL\Connection and fix a small bug
• BC break?no

Changes Made:

1. Added SSL Certificate Support for PostgreSQL:

   • Extended the list of supported configuration parameters to include and sslcert, sslrootcert
   • These parameters allow specifying SSL certificates for secure connections to PostgreSQL databases

2. Fixed TypeError Bug in Connection Handling:

   • Problem: The original code directly assigned values to $this->connection property, which has a strict type PgSql\Connection declaration
   • Issue: When pg_connect() returned false (connection failure), it caused a TypeError because false cannot be assigned to a property typed as PgSql\Connection
   • Consequence: The TypeError was thrown before reaching the proper error handling code below, making it impossible to determine what connection error actually occurred
   • Solution: Introduced a local variable that: $connection
     • First collects the connection result (whether from $config['resource'] or pg_pconnect())
     • Then validates the connection type with proper error checking
     • Only assigns to $this->connection after successful validation
     • This ensures that connection failures are properly caught and reported with meaningful error messages instead of generic TypeErrors

Technical Impact:

• Before: Connection failures resulted in unhelpful TypeErrors, masking the actual database connection issues
• After: Connection failures now properly throw with descriptive error messages, making debugging much easier Dibi\DriverException
• Bonus: Added support for SSL certificate configuration in PostgreSQL connections