[Ansor][AutoTVM v2.0] Phase 1: Add follow_split and follow_fused_split steps (#6142)

[Ansor][AutoTVM v2.0] Phase 1: Add follow_split and follow_fused_split steps (#6142)

* Add cache_read/cache_write step

* Update

* Add follow split and follow fused split

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
Conflicts:
	src/auto_scheduler/compute_dag.cc
	src/auto_scheduler/transform_step.cc
	src/auto_scheduler/transform_step.h
	tests/python/unittest/test_auto_scheduler_loop_state.py

* add loop_state.py

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Update

* Update

* Update state->current_compute_dag to Optional

* Add some doc strings for Follow_Split and Follow_fused_split

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Check code using c-lint

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Add more doc strings and change the order for follow split.

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Add record test for follow_split and follow_fused_split

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Add record test for follow_split

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Add record test for follow_fused_split.

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Add test record for follow_fused_split
1. delete a comment
2. add "fuse" between follow_split and follow_fused_split

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Add doc strings for some functions and variables

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Fix the code format in src/auto_scheduler/transform_step.h

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Update

* Update doc

* Update

* Update

* Fix follow_split and follow_fused_split record test.

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Doc update

* Update some doc strings

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Fix code style and some function definitions.

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Update

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Add comments on parameters.

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Add more doc strings and fix some.

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Update

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Update

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Update

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
* Update.

Signed-off-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>
Co-authored-by: chengfan.jcf <chengfan.jcf@alibaba-inc.com>
Co-authored-by: jingbang.yjb <jingbang.yjb@alibaba-inc.com>