Added-failoverandinitial-version‑fields (#621)

Added two new fields to the `GetClusterInfoResponse` proto:

```protobuf
  int64 failover_version_increment = 9;
  int64 initial_failover_version   = 10;
```

[Server PR](temporalio/temporal#8090)

---------

Co-authored-by: Roey Berman <[email protected]>

Author: vaibhavyadav-dev

openapi/openapiv2.json

@@ -11198,6 +11198,14 @@
         },
         "visibilityStore": {
           "type": "string"
+        },
+        "initialFailoverVersion": {
+          "type": "string",
+          "format": "int64"
+        },
+        "failoverVersionIncrement": {
+          "type": "string",
+          "format": "int64"
         }
       },
       "description": "GetClusterInfoResponse contains information about Temporal cluster."

openapi/openapiv3.yaml

@@ -8242,6 +8242,10 @@ components:
           type: string
         visibilityStore:
           type: string
+        initialFailoverVersion:
+          type: string
+        failoverVersionIncrement:
+          type: string
       description: GetClusterInfoResponse contains information about Temporal cluster.
     GetCurrentDeploymentResponse:
       type: object

temporal/api/workflowservice/v1/request_response.proto

@@ -1157,6 +1157,8 @@ message GetClusterInfoResponse {
     int32 history_shard_count = 6;
     string persistence_store = 7;
     string visibility_store = 8;
+    int64 initial_failover_version = 9;
+    int64 failover_version_increment = 10;
 }
 
 message GetSystemInfoRequest {