Draft a proposal for the Upgrades & Dependency Management epic

[aaronshurley]

Describe the problem/challenge you have
We have many use cases that we'd like to address related to Upgrades & Dependency Management (see #361) for kapp-controller.

Describe the solution you'd like
Following the proposals process, we'd like to gain alignment on what we're setting out to achieve with this epic.

Anything else you would like to add:

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[aaronshurley]

@danielhelfand Just a heads up that this issue exists in case you want to capture any context here.