feat(cloudflare,deno,vercel-edge): Add span streaming support (#20127)

This PR adds span streaming support to cloudflare, deno and vercel edge
SDKs. Similarly to Node, we check for the `traceLifecycle` option and
add `spanStreamingIntegration` based on the option.

Also added unit, integration and e2e tests to ensure that the SDKs
actually send spans. Similarly to Node and Browser, we'll likely still
miss data from event processors but we can follow up with this later.

h/t @JPeer264 for the e2e test helpers! I cherry-picked them from
getsentry/sentry-javascript#17852 and adjusted them for naming.

ref
[JS-1010](https://linear.app/getsentry/issue/JS-1010/span-streaming-implementation)
#17836

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Co-authored-by: Jan Peer Stöcklmair <jan.peer@sentry.io>