Support version upgrades for actors and providers

[brooksmtownsend]

Currently, with actors and providers we check for existence of, for actors, a public key, and for providers, a public key/contract ID/link name triple.

We do not take into account version information, which will be problematic when upgrading actors and providers to newer versions or using wadm as a part of an inner dev loop. The Actor and Provider scalers should also look for the versions of those running assets and upgrade older versions if necessary as a part of reconciling.

[stale]

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[brooksmtownsend]

I plan to take this either this or next week

[brooksmtownsend]

Closing in favor of #143 because I forgot about this one and put more detail in the other one 😆