feat: push preferences

[tschellenbach]

Add support for push preferences at the user and member/channel level.

@oliverlaz can you help me wrap this up? (not entirely familiar with your workflow and project setup)

@tbarbugli fyi

[github-actions]

Size Change: +726 B (+0.16%)

Total Size: 464 kB

Filename	Size	Change
dist/browser.es.js	101 kB	+168 B (+0.17%)
dist/browser.full-bundle.min.js	57 kB	+54 B (+0.09%)
dist/browser.js	102 kB	+168 B (+0.16%)
dist/index.es.js	101 kB	+171 B (+0.17%)
dist/index.js	102 kB	+165 B (+0.16%)

_{compressed-size-action}

[oliverlaz]

hi @tschellenbach, I pushed this commit that improves the TypeScript type definitions.
The rest looks good to me.