Overhaul and stabilize AOT kernel launching mechanism

[voltjia]

pytest output:

============================= test session starts ==============================
platform linux -- Python 3.10.19, pytest-9.0.2, pluggy-1.6.0
rootdir: /home/huangjiacheng/ninetoothed
configfile: pyproject.toml
plugins: cov-7.0.0, anyio-4.12.1, xdist-3.8.0
collected 209 items

tests/test_add.py .                                                      [  0%]
tests/test_addmm.py ..                                                   [  1%]
tests/test_aot.py .........                                              [  5%]
tests/test_attention.py ........                                         [  9%]
tests/test_auto_tuner.py ....                                            [ 11%]
tests/test_clone.py ....                                                 [ 13%]
tests/test_conv2d.py ....                                                [ 15%]
tests/test_data_ptr.py .                                                 [ 15%]
tests/test_debugging.py .                                                [ 16%]
tests/test_dropout.py .                                                  [ 16%]
tests/test_eval.py ........                                              [ 20%]
tests/test_expand.py .                                                   [ 21%]
tests/test_generation.py ............................................... [ 43%]
.............................                                            [ 57%]
tests/test_getitem.py ..........                                         [ 62%]
tests/test_ipynb.py .                                                    [ 62%]
tests/test_jagged.py ................                                    [ 70%]
tests/test_matmul.py ..                                                  [ 71%]
tests/test_max_pool2d.py ..                                              [ 72%]
tests/test_naming.py .......                                             [ 75%]
tests/test_pad.py ................................................       [ 98%]
tests/test_pow.py .                                                      [ 99%]
tests/test_softmax.py .                                                  [ 99%]
tests/test_unsqueeze.py .                                                [100%]

======================= 209 passed in 223.71s (0:03:43) ========================