Introduce a common langchain middleware module

[undernagruzez]

Is your feature request related to a problem?

Right now, Athena has several modules that are working with the langchain middleware. This code is not shared among all modules, but was copypasted. This would lead to a significant effort in maintenance.

Describe the solution you'd like

Introduce a new package in the athena core module, and reuse the code from it.

Describe the alternatives you've considered

No response

Additional context

No response