Release langchain-core==0.2.11

Changes since langchain-core==0.2.10

core[patch]: Release 0.2.11 (#23780)
core[patch]: mark RemoveMessage beta (#23656)
core[patch]: fix nested sections for mustache templating (#23747)
core[patch]: Add versionadded to get_by_ids (#23728)
core[minor]: Create BaseMedia object (#23639)
core[patch]: use async messages where possible (#23718)
core[minor]: Add maxsize for InMemoryCache (#23405)
core[patch]: Fix llm string representation for serializable models (#23416)
core: fix NameError (#23658)
core[minor]: Add get_by_ids to vectorstore interface (#23594)
core: add RemoveMessage (#23636)
docs[patch]: Update diagrams (#23613)
core: chat_* docstrings (#23412)
core[patch]: Add unit test when catching generator exit (#23402)
core[minor]: Add optional ID field to Document schema (#23411)
docs[patch]: Update docs introduction and README (#23558)
core[patch]: docstrings agents (#23502)
core[patch]: callbacks docstrings (#23375)
core: docstrings example_selectors (#23542)
core[patch]: use args_schema doc for tool description (#23503)