[lambda][output] updating slack output format to support large messages #135
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to @airbnb/streamalert-maintainers
size: medium
changes
Slack output will now use attachments and split the message on the Slack recommended size of 4000 characters/bytes.
Output will also be formatted with tabs and "markdown" styling.
Messages will look similar to this in Slack (with the proper App name/icon):
Multi-part messages will have a
(Part # of n)
string afterRecord