Co-authored-by: Marcus Schiesser <mail@marcusschiesser.de>

Co-authored-by: Marcus Schiesser <marcus.schiesser@googlemail.com>

Co-authored-by: Alex Yang <himself65@outlook.com>

Co-authored-by: Marcus Schiesser <mail@marcusschiesser.de>

Co-authored-by: yisding <yi.s.ding@gmail.com>

Co-authored-by: Alex Yang <himself65@outlook.com>

* refactor: merge HistoryChatEngine and ContextChatEngine and use ChatHistory for all chat engines

* fix: add safeguard for tokensToSummarize

* refactor: unfold chat engines to own folder

* refactor: extract LLM types

* refactor: move multi-modal types to llm

* docs(changeset): Remove HistoryChatEngine and use ChatHistory for all chat engines

* dev: add debug launcher and don't lint generated code

This reverts commit c8bbc101.