Allow configuration of SyncPeriod per object

[sbueringer]

Today we only have SyncPeriod on the cache.Option struct.
Accordingly the SyncPeriod is set globally for the entire cache.

I would be nice to be able to configure it per object, i.e. add the SyncPeriod field to the ByObject struct as well

[sbueringer]

@alvaroaleman opinions?

[alvaroaleman]

@alvaroaleman opinions?

The idea makes sense. I don't think the cache supports that, but it could be done through a source that peridically lists and enqueues everything

[sbueringer]

Aren't we just using the "global" SyncPeriod today for all informers and if we would have the config by object we could just use the object specific SyncPeriod when we create the informer?

(~ similar to other fields we have in the ByObject struct)