Ability to use Sidecar to send logs directly to Graylog Cloud

[drewmiranda-gl]

What

It would be a helpful selling point to allow customers to ship logs to Graylog Cloud using the Graylog Sidecar, without requiring a Graylog Forwarder.

Why/Justification

Currently, the only way to send logs to Graylog Cloud is via a Graylog Forwarder. This is great for smaller environment or networks with a simple topology. However, more complex topologies and networks with a large number of sites may need to deploy multiple forwarders which creates significant management overhead which is meant to be alleviated by using graylog cloud.

Additionally, some companies, while having on prem log sources, do not maintain any on-prem datacenters, and would be required to pay for cloud infrastructure in order to host at least a single graylog forwarder.

Allowing the sidecar to natively ship logs to Graylog Cloud would be a huge win and greatly simplify log onboarding. This would also allow primarily windows only environments to ship windows logs without requiring a linux server.