[Fix](bangc-ops): fix border_align

[PetrelYy]

Thanks for your contribution and we appreciate it a lot.

1. Motivation

fix split-c mode in border_align
fix some potential error, like mem leaks, et

2. Modification

modified:   ../kernels/border_align_backward/border_align_backward.cpp
modified:   ../kernels/border_align_backward/border_align_backward.h
modified:   ../kernels/border_align_backward/border_align_backward_union1.mlu
modified:   ../kernels/border_align_forward/border_align_forward.cpp
modified:   ../kernels/border_align_forward/border_align_forward.h
modified:   ../kernels/border_align_forward/border_align_forward_union1.mlu
modified:   ../kernels/utils/common.h
modified:   ../test/mlu_op_gtest/pb_gtest/src/zoo/border_align_forward/border_align_forward.cpp
modified:   ../../docs/bangc-docs/design_docs/border_align_forward/border_align_forward.md
renamed:    ../../docs/bangc-docs/design_docs/border_align_forward/figure3.png -> ../../docs/bangc-docs/design_docs/border_align_forward/figure.png
deleted:    ../../docs/bangc-docs/design_docs/border_align_forward/figure1.png
deleted:    ../../docs/bangc-docs/design_docs/border_align_forward/figure2.png

3. Test Report

370 & 590 all
release_temp、nan/inf、large-c、near_2g_num case all pass

[mahxn0]

top ，x_stride = box_height / pool_size; y_stride = 0;
left ，x_stride = 0; y_stride = box_height / pool_size;
bottom ，x_stride = -box_height / pool_size; y_stride = 0;
right ，x_stride = 0; y_stride = -box_height / pool_size;