Add new view model for workspace

- UI needs to present a combination of properties
  from two data models (Workspace and WorkspaceAgent)

Author: fioan89

src/main/kotlin/com/coder/gateway/models/WorkspaceAgentModel.kt

@@ -0,0 +1,16 @@
+package com.coder.gateway.models
+
+import com.coder.gateway.sdk.Arch
+import com.coder.gateway.sdk.OS
+import com.coder.gateway.sdk.v2.models.ProvisionerJobStatus
+import com.coder.gateway.sdk.v2.models.WorkspaceBuildTransition
+
+data class WorkspaceAgentModel(
+    val name: String,
+
+    val jobStatus: ProvisionerJobStatus,
+    val buildTransition: WorkspaceBuildTransition,
+
+    val agentOS: OS?,
+    val agentArch: Arch?
+)