Contructing LLMClientInterface in constructor of QodeAssistClient when
initializing base class severely limits what can be done. In particular,
no members can be referred to, because nothing of the class instance
itself has been initialized at that point of time.
This commit is a result of the following commands:
clang-format-19 --style=file -i $(git ls-files | fgrep .cpp)
clang-format-19 --style=file -i $(git ls-files | fgrep .hpp)
