Add `idempotency_key` to the chat message entity

mentioned in merge request pleroma-fe!1228 (merged)

changed title from Draft: {-Broadcast idempotency_key via the pleroma:chat_mention event-} to Draft: {+Add idempotency_key to the pleroma:chat_mention streaming event payload+}

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Could we have some asserts about the presence of the idempotency key in the responses? Otherwise LGTM

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69fd32ec - Add `idempotency_key` to the chat_message entity.

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changed title from Add idempotency_key to the {-pleroma:chat_mention streaming event payload-} to Add idempotency_key to the chat message entity

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69fd32ec...e02101e1 - 52 commits from branch pleroma:develop
a0b5ed3a - Add `idempotency_key` to the chat_message entity.

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Updated it to include the idempotency_key in the GET /api/v1/pleroma/chats/:id/messages response as well. When the streaming is disabled, FE can sometimes receive the polling response between the DB insert and the HTTP message sending response, which can also lead to creation of duplicates on FE unless the identifier is provided.

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a3f67d61 - Add `idempotency_key` to the chat_message entity.

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a3f67d61...f9ece1a7 - 93 commits from branch pleroma:develop
108e9c28 - Add `idempotency_key` to the chat_message entity.

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108e9c28...b48724af - 113 commits from branch pleroma:develop
22ede934 - Add `idempotency_key` to the chat_message entity.

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changed the description

marked as a Work In Progress

added 62 commits

22ede934...2fd384e0 - 61 commits from branch pleroma:develop
a4e87b55 - Add `idempotency_key` to the chat_message entity.

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Is there anything else this needs? It'd be nice to have this for frontend

Sorry for not commenting earlier, I don't like that this is stored in the database / validated. I'd rather put it in something like cachex for a minutes.