destroy static method
Implementation
static Future<void> destroy() async {
_tokenCache = null;
try {
await _secure.delete(key: _kSecureToken);
} catch (_) {/* ignore */}
final keys = _p.getKeys().where((k) => k.startsWith('wt_session_')).toList();
for (final key in keys) {
await _p.remove(key);
}
}