add knob controls unroll on top of vectorization in inner reduction

[liqiangxl]

Feature Added: Knob for Unrolling on Top of Vectorization in Inner Reduction

Introduced a new knob to control unrolling in conjunction with vectorization for inner reduction loops. Note: The knob is currently not integrated into the heuristics and must be manually enabled for use. Added a test case to validate the functionality and ensure the knob's proper behavior.

[liqiangxl]

!test

[liqiangxl]

!test

[liqiangxl]

!test