Hot Reloading: Actor State Store Reloading

[JoshVanL]

Part of #1172
Branched from #7260

Adds support for actor state store hot reloading.

PR updates the actors package so that the actor state store is dynamically
retrieved from the component store every time the state it invoked. The
passed static actor state store name previously used to retrieve the
state store has been removed.

The component store has been updated to track the current actor state
store. It is no longer tracked by the state processor, and instead the
state processor updates the latest in the component store.

Like before, the actor state store must be configured on Dapr startup,
else the actor subsystem runtime will not be enabled, even if an actor
state store is hot reloaded later.

Adds actor hotreloading integration tests for the actor state store.

[ItalyPaleAle]

I would like us to be very careful with hot-reloading actor state store please, especially as this interacts with the reminder store. The actor state store is not meant to be hot-reloaded today, and the impact on reminders is unclear.

For example, in the current code I do not see the method that triggers reloading of reminders when the actor state store changes. This could have very major impacts on the actor subsystem.

Another thing to consider is that there could be active actors which loaded state, and assume that they can store it back (with etag matching) later. If the state store changes, that could cause some significant issues.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 64.33%. Comparing base (51dc3a1) to head (6c3c25a).
Report is 189 commits behind head on master.

Files	Patch %	Lines
pkg/runtime/processor/state/state.go	30.00%	6 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7287      +/-   ##
==========================================
+ Coverage   64.31%   64.33%   +0.01%     
==========================================
  Files         238      238              
  Lines       21877    21862      -15     
==========================================
- Hits        14070    14064       -6     
+ Misses       6598     6585      -13     
- Partials     1209     1213       +4     

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[dapr-bot]

This pull request has been automatically marked as stale because it has not had activity in the last 60 days. It will be closed in 7 days if no further activity occurs. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!