Use IntArrayView to add/remove n-gram entry.

...tructure/backward/v402/ver4_patricia_trie_node_writer.cpp

.../structure/backward/v402/ver4_patricia_trie_node_writer.h

...ary/structure/backward/v402/ver4_patricia_trie_policy.cpp

...ionary/structure/pt_common/dynamic_pt_updating_helper.cpp

...ctionary/structure/pt_common/dynamic_pt_updating_helper.h

...olicyimpl/dictionary/structure/pt_common/pt_node_writer.h

...ictionary/structure/v4/ver4_patricia_trie_node_writer.cpp

.../dictionary/structure/v4/ver4_patricia_trie_node_writer.h

...mpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp

native/jni/src/utils/int_array_view.h

native/jni/tests/utils/int_array_view_test.cpp