Added support for internal filtering with createTranscript method

[fronkdev]

With this PR, you're able to directly filter messages with the createTranscript method without the need of having to fetch and filter messages yourself and parse them into the generateFromMessages method.

I have:

• Updated and tested typings
• Updated and tested createTranscript

Tested Code:

  const attachment = await createTranscript(channel, {
    // Filter bot messages
    filter: (message) => !message.author.bot
  });

The below attachment is the result of the above tested code. You can see that the only messages are from me and the attachment (of the actual channel in Discord) shows the same messages but including Dyno, a bot, which I am filtering out in the test.