Fix #1240 Update chat_unfurl to support source/unfurl_id parameters

[seratch]

Summary

This pull request resolves #1240

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.

[srajiang]

Thanks @seratch! :)

[codecov]

Codecov Report

Merging #1241 (5e533d3) into main (e4ccb13) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1241      +/-   ##
==========================================
- Coverage   86.62%   86.61%   -0.01%     
==========================================
  Files         111      111              
  Lines       11026    11026              
==========================================
- Hits         9551     9550       -1     
- Misses       1475     1476       +1     

Impacted Files	Coverage Δ
slack_sdk/web/async_client.py	85.14% <ø> (ø)
slack_sdk/web/client.py	86.52% <ø> (ø)
slack_sdk/web/legacy_client.py	86.24% <ø> (ø)
slack_sdk/socket_mode/builtin/internals.py	74.12% <0.00%> (-0.44%)	⬇️

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[angrychimp]

Thank you for the quick response!