introduced `rawMessageInfoFromServerDBRow` function to reaction message spec. `rawMessageInfoFromServerDBRow` does some basic parsing of the message content from the db and returns the information necessary for a `RawReactionMessageInfo` object
**UPDATE**
Got some feedback to grab `targetMessageID` from directly from the `messages` table instead of from the `messageContent`. To do this successfully, I had to modify some of the `message-fetchers` queries to include `targetMessageID` in the query selection.
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Depends on D5690
Linear Task: [[ https://linear.app/comm/issue/ENG-2245/setup-message-reaction-spec | ENG-2245 ]]