update services.yaml schema to support 2021.3

Author: raman325

custom_components/pyscript/services.yaml

@@ -6,37 +6,89 @@ reload:
     global_ctx:
       description: only reload this specific global context (file or app)
       example: file.example
+      required: false
+      selector:
+        text:
 
 jupyter_kernel_start:
   description: Start a jupyter kernel for interactive use; called by Jupyter front end
   fields:
     shell_port:
       description: shell port number
       example: 63599
+      required: false
+      selector:
+        number:
+          min: 49152
+          max: 65535
     iopub_port:
       description: iopub port number
       example: 63598
+      required: false
+      selector:
+        number:
+          min: 49152
+          max: 65535
     stdin_port:
       description: stdin port number
       example: 63597
+      required: false
+      selector:
+        number:
+          min: 49152
+          max: 65535
     control_port:
       description: control port number
       example: 63596
+      required: false
+      selector:
+        number:
+          min: 49152
+          max: 65535
     hb_port:
       description: heartbeat port number
       example: 63595
+      required: false
+      selector:
+        number:
+          min: 49152
+          max: 65535
     ip:
       description: ip address to connect to jupyter front end
       example: 127.0.0.1
+      default: 127.0.0.1
+      required: false
+      selector:
+        text:
     key:
       description: security key for signing
       example: 012345678-9abcdef023456789abcdef
+      required: true
+      selector:
+        text:
     transport:
       description: type of transport
       example: tcp
+      default: tcp
+      required: false
+      selector:
+        select:
+          options:
+            - tcp
+            - udp
     signature_scheme:
       description: signing algorithm
       example: hmac-sha256
+      required: false
+      default: hmac-sha256
+      selector:
+        select:
+          options:
+            - hmac-sha256
     kernel_name:
       description: name of kernel
       example: pyscript
+      required: true
+      default: pyscript
+      selector:
+        text: