Feat/multi model reader (#561)

* fix: multi-model memreader init error

* fix: kwargs bug

* feat: init examples for each multi-model parser

* feat: simple user_parser

* feat: add multi-model-parser example

* feat: add multi-model-parser example

* feat: update user parser: only tackle with ChatCompletionUserMessageParam message

* feat: rewrite create source and parse fast for system parser

* feat: rewrite create source and parse fast for system parser

* feat: rewrite assistant parser

* feat: add additional sources to assistant parser

* feat: add concat fast-mode memories from multi parsers

* refactor: fix name

* refactor: fix name

* refactor: fix name

* refactor: fix name

* refactor: fix name

* refactor: fix name

* feat: add fine process path-A in multi_modal_struct

* feat: add fine process path-A in multi_modal_struct

* feat: add compare simple&multimodal example

* feat: add _process_transfer_multi_modal_data in multimodal

Author: CaralHsi