Add host target platform (#4783)

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

esphome/components/host/preferences.cpp

@@ -0,0 +1,36 @@
+#ifdef USE_HOST
+
+#include "preferences.h"
+#include <cstring>
+#include "esphome/core/preferences.h"
+#include "esphome/core/helpers.h"
+#include "esphome/core/log.h"
+#include "esphome/core/defines.h"
+
+namespace esphome {
+namespace host {
+
+static const char *const TAG = "host.preferences";
+
+class HostPreferences : public ESPPreferences {
+ public:
+  ESPPreferenceObject make_preference(size_t length, uint32_t type, bool in_flash) override { return {}; }
+
+  ESPPreferenceObject make_preference(size_t length, uint32_t type) override { return {}; }
+
+  bool sync() override { return true; }
+  bool reset() override { return true; }
+};
+
+void setup_preferences() {
+  auto *pref = new HostPreferences();  // NOLINT(cppcoreguidelines-owning-memory)
+  global_preferences = pref;
+}
+
+}  // namespace host
+
+ESPPreferences *global_preferences;  // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
+
+}  // namespace esphome
+
+#endif  // USE_HOST