Add granular user change events

[seratch]

This pull request adds three new events:

• https://api.slack.com/events/user_huddle_changed
• https://api.slack.com/events/user_status_changed
• https://api.slack.com/events/user_profile_changed

Category (place an x in each of the [ ])

• bolt (Bolt for Java)
• bolt-{sub modules} (Bolt for Java - optional modules)
• slack-api-client (Slack API Clients)
• slack-api-model (Slack API Data Models)
• slack-api-*-kotlin-extension (Kotlin Extensions for Slack API Clients)
• slack-app-backend (The primitive layer of Bolt for Java)

Requirements

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you are agreeing to the those rules.

[codecov]

Codecov Report

Merging #984 (af2f93d) into main (aea01bb) will increase coverage by 0.04%.
The diff coverage is 100.00%.

❗ Current head af2f93d differs from pull request most recent head fface80. Consider uploading reports for the commit fface80 to get more accurate results

@@             Coverage Diff              @@
##               main     #984      +/-   ##
============================================
+ Coverage     76.87%   76.92%   +0.04%     
- Complexity     3677     3684       +7     
============================================
  Files           400      403       +3     
  Lines         11089    11095       +6     
  Branches       1105     1105              
============================================
+ Hits           8525     8535      +10     
+ Misses         1895     1890       -5     
- Partials        669      670       +1     

Impacted Files	Coverage Δ
...ckend/events/handler/UserHuddleChangedHandler.java	100.00% <100.00%> (ø)
...kend/events/handler/UserProfileChangedHandler.java	100.00% <100.00%> (ø)
...ckend/events/handler/UserStatusChangedHandler.java	100.00% <100.00%> (ø)
...va/com/slack/api/socket_mode/SocketModeClient.java	68.15% <0.00%> (+0.63%)	⬆️
...i/socket_mode/impl/SocketModeClientJavaWSImpl.java	68.42% <0.00%> (+1.97%)	⬆️

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[mwbrooks]

Nice work @seratch! I've left a minor suggestion on a comment change, otherwise looks greats!