Remove client class

[kapilraajP]

Purpose

Currently, the Snowflake driver is visible as a connector in the Choreo marketplace.
This is because of the usage of a client class in the driver module. This PR removes the client class from the driver module.

Resolves https://github.com/ballerina-platform/ballerina-extended-library/issues/355

Goals

Remove client class to avoid detecting the driver module as a connector in the Choreo marketplace.

Approach

Remove client class from the driver module

Release note

Remove client class from the driver module

Automation tests

• Unit tests

  Done

• Integration tests

  Done

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes
• Ran the FindSecurityBugs plugin and verified the report? no
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes

Test environment

Ballerina Version: 2201.0.2
Operating System: Ubuntu 20.04
Java SDK: 11