EntityBase Name can stay in flash. (#4594)

* `EntityBase`can stay in flash.

* Trying to please the CI.

---------

Co-authored-by: Your Name <you@example.com>

esphome/core/string_ref.cpp

@@ -0,0 +1,12 @@
+#include "string_ref.h"
+
+namespace esphome {
+
+#ifdef USE_JSON
+
+// NOLINTNEXTLINE(readability-identifier-naming)
+void convertToJson(const StringRef &src, JsonVariant dst) { dst.set(src.c_str()); }
+
+#endif  // USE_JSON
+
+}  // namespace esphome