API: Term command handler (#98)

* Stub out initial terminal request

* Formatting

* Cleanup + add stress test

* Upgrade to [email protected]

Author: bryphe

.ci/esy-build-steps.yml

@@ -4,8 +4,8 @@ steps:
   - task: NodeTool@0
     inputs:
       versionSpec: '8.9'
-  - script: npm install -g esy@0.5.7
-    displayName: 'npm install -g esy@0.5.7'
+  - script: npm install -g esy@0.6.2
+    displayName: 'npm install -g esy@0.6.2'
   - script: esy install
     displayName: 'esy install'
   - script: esy build