Add CST816 touchscreen driver (#5941)

* Add CST816 touchscreen

esphome/components/cst816/binary_sensor/__init__.py

@@ -0,0 +1,28 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import binary_sensor
+
+from .. import cst816_ns
+from ..touchscreen import CST816Touchscreen, CST816ButtonListener
+
+CONF_CST816_ID = "cst816_id"
+
+CST816Button = cst816_ns.class_(
+    "CST816Button",
+    binary_sensor.BinarySensor,
+    cg.Component,
+    CST816ButtonListener,
+    cg.Parented.template(CST816Touchscreen),
+)
+
+CONFIG_SCHEMA = binary_sensor.binary_sensor_schema(CST816Button).extend(
+    {
+        cv.GenerateID(CONF_CST816_ID): cv.use_id(CST816Touchscreen),
+    }
+)
+
+
+async def to_code(config):
+    var = await binary_sensor.new_binary_sensor(config)
+    await cg.register_component(var, config)
+    await cg.register_parented(var, config[CONF_CST816_ID])