Add WorkflowExecutionStartedEventAttributes.eager_execution_accepted (#614)

**Why?**

For debugging purposes.

Author: bergundy

openapi/openapiv2.json

@@ -16298,6 +16298,10 @@
         "inheritedPinnedVersion": {
           "$ref": "#/definitions/v1WorkerDeploymentVersion",
           "description": "If present, the new workflow should start on this version with pinned base behavior.\nChild of pinned parent will inherit the parent's version if the Child's Task Queue belongs to that version.\n\nNew run initiated by workflow ContinueAsNew of pinned run, will inherit the previous run's version if the\nnew run's Task Queue belongs to that version.\n\nNew run initiated by workflow Cron will never inherit.\n\nNew run initiated by workflow Retry will only inherit if the retried run is effectively pinned at the time\nof retry, and the retried run inherited a pinned version when it started (ie. it is a child of a pinned\nparent, or a CaN of a pinned run, and is running on a Task Queue in the inherited version).\n\nPinned override is inherited if Task Queue of new run is compatible with the override version.\nOverride is inherited separately and takes precedence over inherited base version."
+        },
+        "eagerExecutionAccepted": {
+          "type": "boolean",
+          "description": "A boolean indicating whether the SDK has asked to eagerly execute the first workflow task for this workflow and\neager execution was accepted by the server.\nOnly populated by server with version >= 1.29.0."
         }
       },
       "title": "Always the first event in workflow history"

openapi/openapiv3.yaml

@@ -13816,6 +13816,12 @@ components:
 
              Pinned override is inherited if Task Queue of new run is compatible with the override version.
              Override is inherited separately and takes precedence over inherited base version.
+        eagerExecutionAccepted:
+          type: boolean
+          description: |-
+            A boolean indicating whether the SDK has asked to eagerly execute the first workflow task for this workflow and
+             eager execution was accepted by the server.
+             Only populated by server with version >= 1.29.0.
       description: Always the first event in workflow history
     WorkflowExecutionTerminatedEventAttributes:
       type: object

temporal/api/history/v1/message.proto

@@ -151,6 +151,11 @@ message WorkflowExecutionStartedEventAttributes {
     // Pinned override is inherited if Task Queue of new run is compatible with the override version.
     // Override is inherited separately and takes precedence over inherited base version.
     temporal.api.deployment.v1.WorkerDeploymentVersion inherited_pinned_version = 37;
+
+    // A boolean indicating whether the SDK has asked to eagerly execute the first workflow task for this workflow and
+    // eager execution was accepted by the server.
+    // Only populated by server with version >= 1.29.0.
+    bool eager_execution_accepted = 38;
 }
 
 message WorkflowExecutionCompletedEventAttributes {