fix(webhook) #2614: added export for 'addAppMetadata'

[pushkarbanjare]

Summary

Fixes #2614

'addAppMetadata' already exists in '@slack/webhook', but it isn't exported from the package entry point, so 'import { addAppMetadata } from "@slack/webhook"' doesn't resolve. This adds the missing re-export, bringing it in line with
'@slack/web-api'.

Requirements

• 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.

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🦋 Changeset detected

Latest commit: ae5637a

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[srtaalej]

hi @pushkarbanjare thank you for raising this issue and addressing it! I see that addAppMetadata is exposed in web-api but not in webhook. im looping in another team member to make sure addAppMetadata wasn't kept internal intentionally 🤔 will keep this thread updated with what i find !✨

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.90%. Comparing base (59a6329) to head (ae5637a).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2626      +/-   ##
==========================================
+ Coverage   88.88%   88.90%   +0.01%     
==========================================
  Files          62       63       +1     
  Lines       10238    10256      +18     
  Branches      451      452       +1     
==========================================
+ Hits         9100     9118      +18     
  Misses       1117     1117              
  Partials       21       21              

Flag	Coverage Δ
cli-hooks	88.90% <100.00%> (+0.01%)	⬆️
cli-test	88.90% <100.00%> (+0.01%)	⬆️
logger	88.90% <100.00%> (+0.01%)	⬆️
oauth	88.90% <100.00%> (+0.01%)	⬆️
socket-mode	88.90% <100.00%> (+0.01%)	⬆️
web-api	88.90% <100.00%> (+0.01%)	⬆️
webhook	88.90% <100.00%> (+0.01%)	⬆️

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[srtaalej]

⭐ ⭐ ⭐