feat: segments API v2

[yaziine]

This PR adds the new segments API, this is part of the totally brand new campaigns API that we are currently building.

Existing code related to campaigns and segments is considered as not working / not used and will be removed (in this and future PRs).

[github-actions]

Size Change: +2.96 kB (+1%)

Total Size: 332 kB

Filename	Size	Change
dist/browser.es.js	71.5 kB	+703 B (+1%)
dist/browser.full-bundle.min.js	44.1 kB	+159 B (0%)
dist/browser.js	72.4 kB	+696 B (+1%)
dist/index.es.js	71.5 kB	+704 B (+1%)
dist/index.js	72.5 kB	+695 B (+1%)

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