Fix failing python tests

[jaguillette]

For some reason, the Python tests have started failing in GitHub actions. A failing run with logs can be seen here: https://github.com/Hedera-Lang-Learn/hedera/actions/runs/3603801082/jobs/6073350159. The issue seems to be with setting up paddle, which is being installed because of lac, which is part of the lemmatizer for Chinese language text. Since we've removed Chinese language support from the app for the time being, this PR removes lac from the requirements and comments out the tests that depend on it. The library and tests should be reinstated as part of bringing Chinese language support back in to the app, when that happens.

[jaguillette]

lac hasn't had updates since May 2021, so it isn't a recent update to that library, but one of its dependencies that my local environment picked up, paddlepaddle got an update on November 17 of this year, so maybe that did it somehow? paddlepaddle isn't in requirements/base.txt though.

[elliottyates]

Makes sense to me. LAC was brought on expressly for a POC; it seemed best positioned when we were looking at it to just show that the functionality is possible, but if concerted effort was made to really get Chinese in a good, scalable and sustainable state, it would probably merit re-evaluating the library landscape.

LAC doesn't pin paddle in any way:
https://github.com/baidu/lac/blob/master/python/setup.py

It's not clear to me from scanning the paddle releases or the LAC issues whether it's fixable, or what's causing it, but LAC certainly doesn't look maintained at the moment, judging by the Issues activity; the only issues closed since early 2021 have been by the issue creators themselves.

Some relevant issues from LAC:

• An example, from before paddle 2.4.0 (the Nov 27 release), of the same issue we're seeing: ImportError: /home/kula/.cache/pypoetry/virtualenvs/spider-gsnVPtZS-py3.10/lib/python3.10/site-packages/paddle/fluid/core_avx.so: undefined symbol: _dl_sym, version GLIBC_PRIVATE baidu/lac#256.
• Feb 2021 issue asking about support for Python 3.8 and paddle 2.0; creator closed it and said, essentially, "seems like it's working": 是否支持paddle2.0 以及 python3.8 baidu/lac#175
• 还有人维护吗 baidu/lac#265, opened within the past 24h, basically just says "anyone maintaining this anymore?"

[arthurian]

Thanks @jaguillette. Disabling the lac dependency and commenting out the chinese tests seems OK for now. As Elliott pointed out, that dependency will need to be re-evaluated anyway when we integrate it back in in along with the rest of the code that was dependent on the lattice structure.

[Tanvez]

Looks good to me, and definitely agreed with what Artie and Elliott pointed out!