Add integration tests utils

[NikitaZotov]

Describe the solution you'd like

• Add utils for agents workflow to tests them;
• Add utils to check memory state, compare it versions.

Describe alternatives you've considered

Firstly, it would be cool to check the performance of agents, for example, through memory states before and after. It is necessary to create specialized utilities that would allow checking the initial state of memory by templates, and then the final state of memory, which has changed as a result of the execution of some functionality. Secondly, there is also a need to create test chains for agents. Since agents are usually executed sequentially, it is necessary to implement the ability to configure these chains: agents in it, inputs, outputs of these agents, as well as branches