Allow unique flush_jitter values for different output plugins

[dbutler-starry]

Feature Request

Opening a feature request kicks off a discussion.

Proposal:

Allow unique flush_jitter values for different output plugins

Current behavior:

Every output plugin is forced to use the same flush_jitter

Desired behavior:

Specify flush_jitter per output plugin in the config file. If no custom flush_jitter is defined for a plugin, use the default flush_jitter (similar to how flush_interval works now)

Use case:

This would be useful for forwarding collections to multiple output plugins that flush at different flush_intervals. It would be nice to be able change flush_jitter per plugin, otherwise each output plugin is forced to use a flush_jitter that fits within the smallest flush_interval