[benchmarks] Add host platform benchmarks for text_sensor and button (#15407)

tests/benchmarks/components/button/bench_button.cpp

@@ -0,0 +1,55 @@
+#include <benchmark/benchmark.h>
+
+#include "esphome/components/button/button.h"
+
+namespace esphome::button::benchmarks {
+
+static constexpr int kInnerIterations = 2000;
+
+// Minimal Button for benchmarking — press_action() is a no-op.
+class BenchButton : public Button {
+ public:
+  void configure(const char *name) { this->configure_entity_(name, 0x12345678, 0); }
+
+ protected:
+  void press_action() override {}
+};
+
+// --- Button::press() ---
+// Measures: ESP_LOGD + press_action() + callback dispatch.
+
+static void ButtonPress(benchmark::State &state) {
+  BenchButton button;
+  button.configure("test_button");
+
+  for (auto _ : state) {
+    for (int i = 0; i < kInnerIterations; i++) {
+      button.press();
+    }
+    benchmark::DoNotOptimize(&button);
+  }
+  state.SetItemsProcessed(state.iterations() * kInnerIterations);
+}
+BENCHMARK(ButtonPress);
+
+// --- Button::press() with callback ---
+// Measures callback dispatch overhead.
+
+static void ButtonPress_WithCallback(benchmark::State &state) {
+  BenchButton button;
+  button.configure("test_button");
+
+  uint64_t callback_count = 0;
+  button.add_on_press_callback([&callback_count]() { callback_count++; });
+
+  for (auto _ : state) {
+    for (int i = 0; i < kInnerIterations; i++) {
+      button.press();
+    }
+    benchmark::DoNotOptimize(callback_count);
+  }
+  state.SetItemsProcessed(state.iterations() * kInnerIterations);
+}
+BENCHMARK(ButtonPress_WithCallback);
+
+}  // namespace esphome::button::benchmarks