Fix #1184 Add exception handling for socket mode - BlockingIOError: Resource temporarily unavailable

[seratch]

Summary

This pull request fixes #1184 . Also, it changes other internal methods in the same way. As for the built-in internal modules, there is less benefit by displaying full stacktrace.

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

• slack_sdk.web.WebClient (sync/async) (Web API client)
• slack_sdk.webhook.WebhookClient (sync/async) (Incoming Webhook, response_url sender)
• slack_sdk.socket_mode (Socket Mode client)
• slack_sdk.signature (Request Signature Verifier)
• slack_sdk.oauth (OAuth Flow Utilities)
• slack_sdk.models (UI component builders)
• slack_sdk.scim (SCIM API client)
• slack_sdk.audit_logs (Audit Logs API client)
• slack_sdk.rtm_v2 (RTM client)
• /docs-src (Documents, have you run ./scripts/docs.sh?)
• /docs-src-v2 (Documents, have you run ./scripts/docs-v2.sh?)
• /tutorial (PythOnBoardingBot tutorial)
• tests/integration_tests (Automated tests for this library)

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've run python3 -m venv .venv && source .venv/bin/activate && ./scripts/run_validation.sh after making the changes.

[codecov]

Codecov Report

Merging #1185 (0604f46) into main (eec08f4) will decrease coverage by 0.14%.
The diff coverage is 10.71%.

@@            Coverage Diff             @@
##             main    #1185      +/-   ##
==========================================
- Coverage   86.69%   86.54%   -0.15%     
==========================================
  Files         110      110              
  Lines       10834    10855      +21     
==========================================
+ Hits         9393     9395       +2     
- Misses       1441     1460      +19     

Impacted Files	Coverage Δ
slack_sdk/socket_mode/builtin/connection.py	64.44% <0.00%> (-3.80%)	⬇️
slack_sdk/socket_mode/builtin/client.py	89.63% <37.50%> (-2.14%)	⬇️

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