feat: Create sample for channel list

[liamcho]

Changes

ticket: AC-4364

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[github-actions]

Size Change: +3.49 kB (+0.58%)

Total Size: 607 kB

Filename	Size	Change
./dist/__bundle-46d64517-********.js	4.01 kB	+3 B (+0.07%)
./dist/__bundle-b5ef7de4-********.js	891 B	+4 B (+0.45%)
./dist/index-********.js	307 kB	+1.81 kB (+0.59%)
./dist/index.es.js	175 B	+5 B (+2.94%)
./dist/index.umd.js	284 kB	+1.62 kB (+0.57%)
./dist/Placeholder.loading-********.js	186 B	+5 B (+2.76%)
./dist/Placeholder.noChannels-********.js	182 B	+2 B (+1.11%)
./dist/Placeholder.noMessages-********.js	181 B	+1 B (+0.56%)
./dist/PlaceholderCommon-********.js	247 B	+4 B (+1.65%)
./dist/style.css	8.66 kB	+37 B (+0.43%)

ℹ️ View Unchanged

Filename	Size
./dist/__bundle-7c3d40f4-********.js	21 B
./dist/Placeholder.error-********.js	345 B

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[liamcho]

blocked: currently server does not support GET my group channels for widget users
https://sendbird.slack.com/archives/C0585965FFA/p1732600027822849