[Dev] Migrate default backend from tir into tilelang

[LeiWang1999]

This pull request focuse on improving backend handling, updating data type mappings, and enhancing matrix multiplication operations. The most important changes are summarized below:

Backend Handling Improvements:

• Modified the backend parameter in the __init__ method of bitblas/ops/general_matmul/__init__.py to use "tl" instead of "tir".
• Updated the dispatch_tir method to dispatch in bitblas/ops/general_matmul/__init__.py.

Data Type Mappings:

• Updated type mappings in bitblas/builder/wrapper/tl.py to use new type names for bfloat16, e4m3_float8, and e5m2_float8.

Matrix Multiplication Enhancements:

• Added support for with_bias in bitblas/ops/general_matmul/tilelang/dense/matmul_simt.py by including bias shape and updating the main computation loop. [1] [2] [3] [4] [5]
• Improved the retrieve_weight_shape method in bitblas/ops/general_matmul/__init__.py to handle cases where prim_func is None.

Testing Enhancements:

• Added an assertion to check the backend type in testing/python/builder/test_backend_tir_builder.py.
• Modified test_repack_from_gptq.py to include a package requirement decorator for auto_gptq and refactored the import statement. [1] [2]

[LeiWang1999]

Luckily to get all tests passed, but we should also implement NF Format and implement relevant test case.