connectionString could be of type object

[HarshDaryani896]

Applications can provide the connection string in the following 2 formats:

1. String

const client = new Client({
  connectionString: 'postgres://username:password@localhost:5432/mydatabase'
});

2. Object

const client = new Client({
  host: 'localhost',
  port: 5432,
  user: 'username',
  password: 'password',
  database: 'mydatabase'
});

When the connection string is of type object, the driver is not able to create the control connection and we see the following log in the output:
Not able to create control connection to any node due to error str.charAt is not a function

This is because for the control connection, we are setting the connectionString expecting it to be String.
This PR implements the fix for this.

Debug pipeline run:

• PG15: #282
• PG14: #283