feat(slack): add includeBotMessages option for interacting with bot_message

[chentsulin]

#625

Implement the following API to interact with bot_message:

By setting includeBotMessages to true:

// bottender.config.js

module.exports = {
  // ...
  slack: {
    enabled: true,
    path: '/webhooks/slack',
    accessToken: process.env.SLACK_ACCESS_TOKEN,
    verificationToken: process.env.SLACK_VERIFICATION_TOKEN,
    includeBotMessages: true, // add this line
  },
};

Then you can use context.event.isBotMessage to determine if the event is a bot message event:

module.exports = function App(context) {
  if (context.event.isBotMessage) {
    console.log(context.event.rawEvent.botId);
  }
};

[codecov-io]

Codecov Report

Merging #635 into release/1.2 will increase coverage by 0.03%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##           release/1.2     #635      +/-   ##
===============================================
+ Coverage        81.08%   81.11%   +0.03%     
===============================================
  Files              100      100              
  Lines             4293     4295       +2     
  Branches          1077     1067      -10     
===============================================
+ Hits              3481     3484       +3     
- Misses             764      767       +3     
+ Partials            48       44       -4

Impacted Files	Coverage Δ
packages/bottender/src/slack/SlackBot.ts	100% <ø> (ø)	⬆️
packages/bottender/src/slack/SlackConnector.ts	93.45% <100%> (+1%)	⬆️
packages/bottender/src/slack/SlackEvent.ts	92.68% <100%> (+0.18%)	⬆️
packages/create-bottender-app/src/shared/log.ts	0% <0%> (ø)	⬆️

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