LVGL stage 2 (#7129)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/lvgl/btn.py

@@ -0,0 +1,25 @@
+from esphome.const import CONF_BUTTON
+from esphome.cpp_generator import MockObjClass
+
+from .defines import CONF_MAIN
+from .types import LvBoolean, WidgetType
+
+
+class BtnType(WidgetType):
+    def __init__(self):
+        super().__init__(CONF_BUTTON, LvBoolean("lv_btn_t"), (CONF_MAIN,))
+
+    async def to_code(self, w, config):
+        return []
+
+    def obj_creator(self, parent: MockObjClass, config: dict):
+        """
+        LVGL 8 calls buttons `btn`
+        """
+        return f"lv_btn_create({parent})"
+
+    def get_uses(self):
+        return ("btn",)
+
+
+btn_spec = BtnType()