Add admin.* APIs for managing automation platform apps

[seratch]

Summary

This pull request adds a few newly added APIs for managing automation platform apps. Refer to https://api.slack.com/admins/workflow-permissions for details.

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 #1398 (f995935) into main (abc6a28) will decrease coverage by 0.17%.
The diff coverage is 75.38%.

@@            Coverage Diff             @@
##             main    #1398      +/-   ##
==========================================
- Coverage   85.55%   85.38%   -0.17%     
==========================================
  Files         111      111              
  Lines       11591    11786     +195     
==========================================
+ Hits         9917    10064     +147     
- Misses       1674     1722      +48     

Files Changed	Coverage Δ
slack_sdk/web/async_client.py	81.94% <75.38%> (-0.39%)	⬇️
slack_sdk/web/client.py	83.13% <75.38%> (-0.46%)	⬇️
slack_sdk/web/legacy_client.py	82.88% <75.38%> (-0.45%)	⬇️

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