Metadata API: report actor runtime status

[ItalyPaleAle]

I promise this PR is not actually 1,600 LOCs! Almost all of them are due to changes in the generated proto files, which are huge for some reason

Updates the metadata API to include additional information on the actor runtime and its status. This is helpful to understand if the actor runtime has completed the initialization, whether the actor runtime is an actor host or just an actor client, and whether the connection with the placement service is active.

Examples (only added data is shown):

1. While the (actor) runtime is initializing (i.e. before the request for /dapr/config has been completed):

   {
     "actorRuntime": {
        "runtimeStatus": "INITIALIZING",
        "hostReady": false
      }
   }

2. Actor runtime has initialized and the app is hosting actors:

   {
     "actorRuntime": {
       "runtimeStatus": "RUNNING",
       "activeActors": [
         {
           "type": "actor-1",
           "count": 1
         },
         {
           "type": "actor-2"
         }
       ],
       "hostReady": true,
       "placement": "placement: connected"
     }
   }

3. Actor runtime has initialized as actor client only (e.g. there's no "actorStateStore" configured):

   {
     "actorRuntime": {
       "runtimeStatus": "RUNNING",
       "hostReady": false,
       "placement": "placement: connected"
     }
   }

4. Actor runtime has initialized but connection to placement is down:

   {
     "actorRuntime": {
       "runtimeStatus": "RUNNING",
       "activeActors": [
         {
           "type": "actor-1",
           "count": 1
         },
         {
           "type": "actor-2"
         }
       ],
       "hostReady": false,
       "placement": "placement: disconnected"
     }
   }

5. Actor runtime is disabled (no placement-host-address option)

   {
     "actorRuntime": {
       "runtimeStatus": "DISABLED",
       "hostReady": false
     }
   }

The actorRuntime.activeActors property is an alias of the pre-existing actors property, which contains a count of active actors. The old property is deprecated but not removed for backwards-compatibility (so the data is included twice, at least for now).

[codecov]

Codecov Report

Attention: 27 lines in your changes are missing coverage. Please review.

Comparison is base (4d626ca) 64.62% compared to head (6e490c8) 64.55%.

Files	Patch %	Lines
pkg/actors/actors_mock.go	0.00%	13 Missing ⚠️
pkg/actors/actors.go	0.00%	6 Missing ⚠️
pkg/actors/placement/placement.go	0.00%	4 Missing ⚠️
pkg/grpc/universalapi/api_metadata.go	60.00%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7040      +/-   ##
==========================================
- Coverage   64.62%   64.55%   -0.08%     
==========================================
  Files         225      225              
  Lines       21023    21050      +27     
==========================================
+ Hits        13587    13588       +1     
- Misses       6278     6299      +21     
- Partials     1158     1163       +5     

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[mukundansundar]

lgtm

[mukundansundar]

/ok-to-test

[mukundansundar]

/test-sdk-all

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/test-version-skew

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