Apply more updates on #216

[seratch]

This pull request applies a few changes on top of #216

• Rename name_for_callable to get_name_for_callable for consistent naming
• Apply get_name_for_callable to listener.ack_function just in case

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

• slack_bolt.App and/or its core components
• slack_bolt.async_app.AsyncApp and/or its core components
• Adapters in slack_bolt.adapter
• Document pages under /docs
• Others

Requirements (place an x in each [ ])

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

• 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 ./scripts/install_all_and_run_tests.sh after making the changes.

[codecov]

Codecov Report

Merging #217 (9f932d5) into main (f0ee5a1) will increase coverage by 0.00%.
The diff coverage is 86.36%.

@@           Coverage Diff           @@
##             main     #217   +/-   ##
=======================================
  Coverage   91.62%   91.63%           
=======================================
  Files         159      159           
  Lines        4767     4769    +2     
=======================================
+ Hits         4368     4370    +2     
  Misses        399      399           

Impacted Files	Coverage Δ
slack_bolt/listener/asyncio_runner.py	84.61% <50.00%> (ø)
slack_bolt/listener/thread_runner.py	89.62% <75.00%> (ø)
slack_bolt/app/app.py	86.78% <100.00%> (ø)
slack_bolt/app/async_app.py	94.70% <100.00%> (+0.01%)	⬆️
slack_bolt/middleware/async_custom_middleware.py	96.15% <100.00%> (ø)
slack_bolt/middleware/custom_middleware.py	100.00% <100.00%> (ø)
slack_bolt/util/utils.py	93.93% <100.00%> (-0.18%)	⬇️
slack_bolt/workflows/step/async_step_middleware.py	96.77% <100.00%> (+0.10%)	⬆️
slack_bolt/workflows/step/step_middleware.py	96.77% <100.00%> (+0.10%)	⬆️

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