support lstm opr in onnx2mge convert

[a419775258]

add support for lstm in onnx2mge converter

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

王博文 seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[dingshaohua960303]

可以补个测试， others LGTM

[daisycx]

LGTM，可以更新下算子列表

[a419775258]

@dingshaohua960303 麻烦看一下，有个代码检查的 ci 没跑过，原因是使用了一个 新版本 megengine 才有的 module。如果不影响的话，能否你动手合入一下？