Add "fromMe" option to fetchMessages

[roigreenberg]

I added an option to get only messages from the bot, or not from the bot. This is needed in some edge case where there is a message from the bot after calling "countUnread". otherwise, fetchMessages will return the bot message instead a unread message.

[roigreenberg]

@PurpShell I removed any unrelated changes, I hope that is enough.

[purpshell]

lgtm

[tuyuribr]

Also don't forget to document it in index.d.ts