Add support for no pipeline accugradient

Add delay tag for fusion op

Optimizer the visite order

add mirror for mini step control

Move the group to attributes

Add gradient_shard control for the mini step

Fix code stype

Fix ut description

Add interface

Merge pull request !23635 from lichen/fix_DTS

1. Add compact_set and use it for node_users;
2. Optimize OrderedMap for shared_ptr;
3. Optimize OrderedSet for shared_ptr;
4. Use better hash for pointer type;
5. Fix a bug about 'erase' in session_basic.cc.