Fix #1256 Socket Mode connection error issue

[seratch]

This pull request resolves #1256 (and probably #1223 too) by improving the internals of the Socket Mode client code, thanks to @oppokui. This pull request changes the default behavior of the onClose listener not to try to reconnect. Originally, the logic was introduced to let the client get back to online much faster, and it has been working well as long as the server side behaves as the code expects. However, it seems that the server now works differently for some reason. Thus, revisiting the logic should be reasonable. Also, the change should be safe enough for the reasons mentioned in the code comment.

If some users would like to switch back to the previous logic for a certain logic, calling SocketModeClient#setAutoReconnectOnCloseEnabled(true) enables them to do so.

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

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[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (5afc51b) 74.32% compared to head (97f9617) 74.36%.

Files	Patch %	Lines
...va/com/slack/api/socket_mode/SocketModeClient.java	0.00%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1265      +/-   ##
============================================
+ Coverage     74.32%   74.36%   +0.04%     
- Complexity     4121     4126       +5     
============================================
  Files           443      443              
  Lines         13078    13087       +9     
  Branches       1322     1323       +1     
============================================
+ Hits           9720     9732      +12     
+ Misses         2586     2582       -4     
- Partials        772      773       +1     

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