[Feature]: Add a configurable backend endpoint that receives the gitDiff for LLM services that rely on module files (system prompt on the LLM end)

[JMN09]

Description

The feature consists of addiing the possibility to communicate with a backend that does not receive system prompts since it relies on module files.

Suggested Solution

Adding a subclass called llmservice that implements AiEngine and is responsible of communicating with such services. In addition to that adding the corresponding configuration variables.

Alternatives

No response

Additional Context

No response