refactor: remove transport logic from client tests (#349)

* add basic code

* fixes

* test fix

* new unit tests

* rename ToolboxTransport

* add py3.9 support

* fix langchain tool tests

* test fix

* lint

* fix tests

* move manage session into transport

* move warning to diff file

* avoid code duplication

* fix tests

* lint

* remove redundant tests

* make invoke method return str

* lint

* fix return type

* small refactor

* refactor: remove transport logic from client tests

* added more test cov

* lint

* rename private method

* fix tests

* lint

* fix tests

* lint

* added test coverage

* lint

Author: twishabansal