[WIP] Add ability to fetch reactions from conversation messages

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Adding ability to fetch reactions from conversation messages</issue_title>
<issue_description>I am new to this git library (not entirely new to XMTP), and also new to rust, but wanted to ask if there was the ability to fetch reactions easily.

seems like reactions are already fetched and used to form num_reactions inside the message struct
num_reactions: msg.reactions.len() as i32,

I may pull and try to test and send in a PR, but wanted to ask if it was as easy as it looks. I dont know the content of msg.reactions but I will try to mess around with this.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Adding ability to fetch reactions from conversation messages #10

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