Add set_threshold and get_value methods to ESP32TouchBinarySensor. (#631)

* Add set_threshold and get_value methods to ESP32TouchBinarySensor and add a test.

* esp32_touch_binary_adaptive: fix formatting

* Remove superfluous static from testcase

* Revert "Remove superfluous static from testcase"

This reverts commit 5a6a111aa8.

* Move into header file

* Update esp32_touch.h


Co-authored-by: olg <x>
Co-authored-by: Otto Winter <otto@otto-winter.com>

tests/test1.yaml

@@ -647,6 +647,7 @@ binary_sensor:
     name: "ESP32 Touch Pad GPIO27"
     pin: GPIO27
     threshold: 1000
+    id: btn_left
   - platform: nextion
     page_id: 0
     component_id: 2
@@ -1154,6 +1155,16 @@ interval:
         if (true) return id(page1); else return id(page2);
     -  display.page.show_next: display1
     -  display.page.show_previous: display1
+  - interval: 2s
+    then:
+      - lambda: |-
+            static uint16_t btn_left_state = id(btn_left)->get_value();
+
+            ESP_LOGD("adaptive touch", "___  Touch Pad '%s' (T%u): val: %u state: %u tres:%u", id(btn_left)->get_name().c_str(), id(btn_left)->get_touch_pad(), id(btn_left)->get_value(), btn_left_state, id(btn_left)->get_threshold());
+            
+            btn_left_state = ((uint32_t) id(btn_left)->get_value()  +  63 * (uint32_t)btn_left_state) >> 6;
+
+            id(btn_left)->set_threshold(btn_left_state * 0.9);
 
 display:
 - platform: lcd_gpio