feat: star/unstar messages

[mpirescarvalho]

adds functions to star/unstar messages to client, chat and message.

client.starMsgs([msg1, msg2]);
client.unstarMsgs([msg1, msg2]);

chat.starMsgs([msg1, msg2]);
chat.unstarMsgs([msg1, msg2]);
    
msg.star();
msg.unstar();

Usage:

client.on('message', async msg => {
    if (msg.body.startsWith('!star')) {
        const quotedMsg = await msg.getQuotedMessage();
        await quotedMsg.star();
    }

    if (msg.body.startsWith('!unstar')) {
        const quotedMsg = await msg.getQuotedMessage();
        await quotedMsg.unstar();
    }
});

Result (bot point of view):

Would it be better if client.starMsgs and chat.starMsgs receives an array of IDs instead of messages?

closes #481

[pedroslopez]

Looks good functionality-wise!

I would argue that the functions on client and chat don't seem to be really useful- calling the function directly on the Message seems to me more natural. I see you suggested using IDs for the functions on client/chat, but to be honest I think I'd prefer just leaving it on the Message and removing the functions from client/chat, unless you see a use case where it would be more convenient to have those.

[mpirescarvalho]

I think you're right. It's done.