Migrate graphene to span first

[sentrivana]

See parent issue for details.

There's a quick port on the span first branch: https://github.com/getsentry/sentry-python/pull/5551/changes It might be incomplete and it's missing tests, but it can be used as a reference or a starting point.

[linear-code]

PY-2328