PackageUtils.cls

public with sharing class PackageUtils {
  private static Set<String> AccountFields = null;
  
  //Method to check if person account is enabled
  public static Boolean isPersonAccountEnabled() {
		if (AccountFields == null) {
			AccountFields = Schema.SObjectType.Account.fields.getMap().keyset();
		}
		return AccountFields.contains('ispesonaccount');
	}
	
	//Method to check if State and Country picklist is enabled
	public static Boolean isStateAndCountryPicklistEnabled() {
	  if (AccountFields == null) {
			AccountFields = Schema.SObjectType.Account.fields.getMap().keyset();
		}
		return AccountFields.contains('shippingcountrycode');
	}
  
}