…del support (#347)

1. Enhance support for `__setitem__` and` __getitem__` of Tensor; Add
SetStridedSlice Op, Roll Op.
2. Add/Update torch mapping for adaptive_avg_pool3d, eq, pad, roll,
matmul, new_zeros, batch_norm, MultiHeadAttention.
3. Update torch Linear mapping to optionally accept transposed weights.
4. Fix a bug where a empty graph will output a zero tensor instead of
the input/weight.

…#345)

Encountered a few minor issues when compiling a transformer-based model
using torch.compile with very large batch sizes, submitting the fix here.

This is a continuation of #347.

1. Add LP normalization task (ToDo: schedule template)
2. Add torch mappings for normalize, clone, zero_, exp, chunk
3. Add ceil_mode=True support for pool2d
4. Fix dtype issue in resize
5. Fix other bugs in pad, conv2d_pattern

Add an ad-hoc implementation of einsum based on pattern matching. Only
supports batched matmul.