Move esp32_ble_server to its own component (#1898)

esphome/components/esp32_ble_server/ble_2901.cpp

@@ -0,0 +1,18 @@
+#include "ble_2901.h"
+#include "esphome/components/esp32_ble/ble_uuid.h"
+
+#ifdef ARDUINO_ARCH_ESP32
+
+namespace esphome {
+namespace esp32_ble_server {
+
+BLE2901::BLE2901(const std::string &value) : BLE2901((uint8_t *) value.data(), value.length()) {}
+BLE2901::BLE2901(const uint8_t *data, size_t length) : BLEDescriptor(esp32_ble::ESPBTUUID::from_uint16(0x2901)) {
+  this->set_value(data, length);
+  this->permissions_ = ESP_GATT_PERM_READ;
+}
+
+}  // namespace esp32_ble_server
+}  // namespace esphome
+
+#endif