torchquantum

- fix precommit
- fix bugs on expval
- refine examples

* support qdev.op such as qdev.h(wires=1)
* QAOA examples
* support joint measurement analytically in measurement
* bug fix

fix several bugs

1. Add support for state.gate such as state.h
2. Add more examples

What's Changed
* RZ gate by jessding in https://github.com/mit-han-lab/torchquantum/pull/1
* [major] merge pruning branch to master by Hanrui-Wang in https://github.com/mit-han-lab/torchquantum/pull/2
* Jiaqi by JeremieMelo in https://github.com/mit-han-lab/torchquantum/pull/3
* Jiaqi by JeremieMelo in https://github.com/mit-han-lab/torchquantum/pull/4
* Params shift by abclzr in https://github.com/mit-han-lab/torchquantum/pull/6
* Corrected module name to import MNIST by googlercolin in https://github.com/mit-han-lab/torchquantum/pull/23
* modify doc conf to init docstring publish task by frogcjn in https://github.com/mit-han-lab/torchquantum/pull/24
* refine class template by frogcjn in https://github.com/mit-han-lab/torchquantum/pull/25
* [minor] update format and theme by frogcjn in https://github.com/mit-han-lab/torchquantum/pull/26
* [minor] adjust dark theme code block and add function template by frogcjn in https://github.com/mit-han-lab/torchquantum/pull/27
* add customized furo doc theme by frogcjn in https://github.com/mit-han-lab/torchquantum/pull/28
* [doc] add ipynb and md support into doc, add one example by frogcjn in https://github.com/mit-han-lab/torchquantum/pull/29
* [major] fix bugs in torchquantum/measure.py by abclzr in https://github.com/mit-han-lab/torchquantum/pull/30
* [doc] Fix examples page in examples/index.rst by frogcjn in https://github.com/mit-han-lab/torchquantum/pull/31

New Contributors
* jessding made their first contribution in https://github.com/mit-han-lab/torchquantum/pull/1
* Hanrui-Wang made their first contribution in https://github.com/mit-han-lab/torchquantum/pull/2
* JeremieMelo made their first contribution in https://github.com/mit-han-lab/torchquantum/pull/3
* abclzr made their first contribution in https://github.com/mit-han-lab/torchquantum/pull/6
* googlercolin made their first contribution in https://github.com/mit-han-lab/torchquantum/pull/23
* frogcjn made their first contribution in https://github.com/mit-han-lab/torchquantum/pull/24

**Full Changelog**: https://github.com/mit-han-lab/torchquantum/commits/v0.1.2