However, to be forward compatitable, it is suitable to keep 'auto_parallel_search_mode' available. This PR recovers the 'auto_parallel_search_mode' interface and adds a warning when using this old interface.

This PR also deals with other codestyle things.

2) 'sharding_propagation' moves to 'search_mode';

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

1) users configure sharding strategies for operators;
2) framework will propagate the strategies from configured-ops to
non-configured ops using BFS;
3) the propagation goal is to minimize redistribution communication
cost;

Merge pull request !17959 from gziyan/add_optimizer_weight_shard_config