Implement proper quote handling for full PostgreSQL connection string support

[wdconinc]

See Database.cpp:

        // Parse connection string (PostgreSQL libpq format)
        // Supported format: "key1=value1 key2=value2 ..."
        // Supported keys: host, dbname, user, password, port
        // 
        // NOTE: This parser does not handle quoted values (e.g., password='my pass').
        // Values containing spaces or special characters will be incorrectly parsed.
        // This limitation is acceptable for the keys currently parsed (host, dbname, 
        // user, password, port) as spaces are unlikely to appear in these values.
        // TODO: Create GitHub issue to implement proper quote handling for full 
        // PostgreSQL connection string support (see libpq documentation).