Store ApiTotalUsage event log data

[jongpie]

Based on this sfxd discord discussion, @jkranz-rk mentioned that there is an ApiTotalUsage event type, which is an Event Monitoring event type that all orgs can leverage, even if you don't have Event Monitoring. This data can be extracted via sfdx (discussed in this help page), but it'd be nice if Nebula Logger had a scheduled job that could extract this data & store it in the Log__c and LogEntry__c custom objects.

Depending on the complexity involved (assuming it's even feasible), it might make sense for this to be a plugin - but if it's relatively small/easy to implement, I'll definitely consider adding it to the core package.