[AC-3510] feat: add callbacks.onWidgetSettingFailure

[bang9]

Changes

• Added callbacks.onWidgetSettingFailure
• Added error page to playground

ticket: AC-3510

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[netlify]

✅ Deploy Preview for chat-ai-widget ready!

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[github-actions]

Size Change: +120 B (+0.02%)

Total Size: 616 kB

Filename	Size	Change
./dist/__bundle-91b5ecea-********.js	890 B	-3 B (-0.34%)
./dist/index-********.js	313 kB	+71 B (+0.02%)
./dist/index.es.js	169 B	-3 B (-1.74%)
./dist/index.umd.js	290 kB	+55 B (+0.02%)

ℹ️ View Unchanged

Filename	Size
./dist/__bundle-46d64517-********.js	4.01 kB
./dist/__bundle-7c3d40f4-********.js	21 B
./dist/style.css	7.93 kB

_{compressed-size-action}

[bang9]

Staging: https://aichatbot-staging.sendbird.com/playground/index.html

[liamcho]

LGTM