add uart button (#5540)

Co-authored-by: Samuel Sieb <samuel@sieb.net>

esphome/components/uart/button/uart_button.cpp

@@ -0,0 +1,17 @@
+#include "uart_button.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace uart {
+
+static const char *const TAG = "uart.button";
+
+void UARTButton::press_action() {
+  ESP_LOGD(TAG, "'%s': Sending data...", this->get_name().c_str());
+  this->write_array(this->data_.data(), this->data_.size());
+}
+
+void UARTButton::dump_config() { LOG_BUTTON("", "UART Button", this); }
+
+}  // namespace uart
+}  // namespace esphome