Add visitor IP to bulk POST data by setting cip and token_auth in eac…

[andrelung]

Description:

Matomo content tracking did not work if you were using a reverse proxy. This fixes https://github.com/matomo-org/tracker-proxy/issues/94

Review

• [x] Functional review done
• [x] Potential edge cases thought about (behavior of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• [ ] ~~Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)~~ no UX change
• [x] Security review done
• [ ] ~~Wording review done~~ no wording changed
• [ ] Code review done
• [ ] Tests were added if useful/possible
• [ ] Reviewed for breaking changes
• [ ] Developer changelog updated if needed
• [ ] Documentation added if needed
• [ ] Existing documentation updated if needed