Add initial catalog and validator plans for Micro:bit (#5443)

I expect these will be iterated on. I just wanted to have something here to get started.

docs/teachertool/catalog.json

@@ -0,0 +1,17 @@
+{
+    "criteria": [
+        {
+            "id": "D285D79B-85E5-4C8D-82D2-5A9E35AB1163",
+            "use": "show_icon_on_screen",
+            "template": "Show an icon on the LED screen",
+            "docPath": "/teachertool"
+        },
+        {
+            "id": "C57344FC-B915-4ACB-A070-67F8FFC18B4B",
+            "use": "read_gpio_pin",
+            "template": "Read a GPIO pin",
+            "description": "Read input from one or more of the microbit GPIO pins.",
+            "docPath": "/teachertool"
+        }
+    ]
+}

docs/teachertool/test/catalog.json

@@ -0,0 +1,3 @@
+{
+    "criteria": []
+}

docs/teachertool/test/validator-plans.json

@@ -0,0 +1,3 @@
+{
+    "validatorPlans": []
+}

docs/teachertool/validator-plans.json

@@ -0,0 +1,60 @@
+{
+    "validatorPlans": [
+        {
+            ".desc": "Set the LED screen.",
+            "name": "show_icon_on_screen",
+            "threshold": 1,
+            "checks": [
+                {
+                    "validator": "blocksExist",
+                    "blockCounts": {
+                        "basic_show_icon": 1
+                    }
+                }
+            ]
+        },
+        {
+            ".desc": "Read input from a GPIO pin.",
+            "name": "read_gpio_pin",
+            "threshold": 1,
+            "checks": [
+                {
+                    "validator": "blocksExist",
+                    "blockCounts": {
+                        "device_pin_event": 1
+                    }
+                },
+                {
+                    "validator": "blocksExist",
+                    "blockCounts": {
+                        "device_pin_is_pressed": 1
+                    }
+                },
+                {
+                    "validator": "blocksExist",
+                    "blockCounts": {
+                        "device_pin_released": 1
+                    }
+                },
+                {
+                    "validator": "blocksExist",
+                    "blockCounts": {
+                        "device_get_digital_pin": 1
+                    }
+                },
+                {
+                    "validator": "blocksExist",
+                    "blockCounts": {
+                        "device_get_analog_pin": 1
+                    }
+                },
+                {
+                    "validator": "blocksExist",
+                    "blockCounts": {
+                        "pins_on_pulsed": 1
+                    }
+                }
+            ]
+        }
+    ]
+}