This is the first step for JDK-8318483:

- Remove Arguments::is_dumping_archive() and Arguments assert_is_dumping_archive()

- Add the following new APIs

class CDSConfig {
  static bool is_dumping_archive();
  static bool is_dumping_static_archive();
  static bool is_dumping_dynamic_archive();
  static bool is_dumping_heap();
};

- Convert some use of DumpSharedSpaces and DynamicDumpSharedSpaces to these new APIs

(More APIs will be added in future sub tasks of JDK-8318483)