[feature] Provide systemd unit for InfluxDB 3 debs/rpms

[jdstrand]

Our 1.x (OSS and Enterprise) and 2.x debs/rpms provide systemd units for InfluxDB; the 3.x packages should do the same. This is important for self-hosted. debs/rpms should be the preferred installation on Linux since they will allow users to stay up to date through the industry-standard OS package update processes, best practices are encoded in the packaging, a consistent install experience that will help Support, etc.

[jdstrand]

I'll mention that this work is planned and being designed and will be in a future release.

[jdstrand]

#27026 is merged and will be in the new 3.8 release.