Add WorkflowPauseEnabled to namespace capabilities (#683)

**What changed?**
Add a `workflow_pause` to namespace capabilities

**Why?**
UI will use this capability while workflow pause is in public preview

**Breaking changes**
No

**Server PR**
NA

Author: spkane31

openapi/openapiv2.json

@@ -12615,6 +12615,10 @@
         "reportedProblemsSearchAttribute": {
           "type": "boolean",
           "title": "True if the namespace supports reported problems search attribute"
+        },
+        "workflowPause": {
+          "type": "boolean",
+          "title": "True if the namespace supports pausing workflows"
         }
       },
       "description": "Namespace capability details. Should contain what features are enabled in a namespace."

openapi/openapiv3.yaml

@@ -9344,6 +9344,9 @@ components:
         reportedProblemsSearchAttribute:
           type: boolean
           description: True if the namespace supports reported problems search attribute
+        workflowPause:
+          type: boolean
+          description: True if the namespace supports pausing workflows
       description: Namespace capability details. Should contain what features are enabled in a namespace.
     NamespaceInfo_Limits:
       type: object

temporal/api/namespace/v1/message.proto

@@ -38,6 +38,8 @@ message NamespaceInfo {
         bool worker_heartbeats = 4;
         // True if the namespace supports reported problems search attribute
         bool reported_problems_search_attribute = 5;
+        // True if the namespace supports pausing workflows
+        bool workflow_pause = 6;
     }
 
     // Namespace configured limits