[Feature] Keep processing the same workflow as long as there are changes

[EngHabu]

Motivation: Why do you think this is important?
It can speed up progressing workflows drastically.

Goal: What should the final outcome look like, ideally?
Propeller's algorithm today does the following:

• Sync WFs from informer
• Iterate on WFs, traverse each and attempt to make progress
• Store
• Wait for next sync period.

With the change, it would:
1- Sync WFs from informer
2- Iterate on WFs
3- Traverse each and attempt to make progress
4- Store
5- If a change is detected (https://github.com/lyft/flytepropeller/blob/master/pkg/controller/handler.go#L212), go back to 3, if not, go to 6
6- Wait for next sync period.

Flyte component

• Overall
• Flyte Setup and Installation scripts
• Flyte Documentation
• Flyte communication (slack/email etc)
• FlytePropeller
• FlyteIDL (Flyte specification language)
• Flytekit (Python SDK)
• FlyteAdmin (Control Plane service)
• FlytePlugins
• DataCatalog
• FlyteStdlib (common libraries)
• FlyteConsole (UI)
• Other

[kumare3]

This has been merged and tested at scale. WE can observe and order of magnitude performance imrpovements