regex-based POC

[masklinn]

Uses the pyo3-based ua-parser/uap-rust#3

Fixes #166

[masklinn]

Forgot to put it in the commit message, but the regex-based parser is generally a bit faster than re2 (it loses by a hair on pgts, but is 80% faster on ua, and 30% on devices):

0.89s call     tests/test_core.py::test_devices[test_device-re2]
0.68s call     tests/test_core.py::test_devices[test_device-regex]
0.56s call     tests/test_core.py::test_ua[pgts_browser_list-regex]
0.54s call     tests/test_core.py::test_ua[pgts_browser_list-re2]
0.11s call     tests/test_core.py::test_ua[test_ua-re2]
0.06s call     tests/test_core.py::test_ua[test_ua-regex]
0.02s call     tests/test_core.py::test_os[test_os-re2]
0.02s call     tests/test_core.py::test_os[test_os-regex]
0.01s call     tests/test_core.py::test_ua[firefox_user_agent_strings-regex]
0.01s call     tests/test_core.py::test_ua[firefox_user_agent_strings-re2]
0.00s call     tests/test_core.py::test_os[additional_os_tests-re2]
0.00s call     tests/test_core.py::test_os[additional_os_tests-regex]

The main draw is that it is compatible with pypy and graal (even though it's a cpyext) and they have excruciating pure python performances on uap tests, here's pypy:

18.55s call     tests/test_core.py::test_devices[test_device-basic]
10.94s call     tests/test_core.py::test_ua[pgts_browser_list-basic]
1.25s call     tests/test_core.py::test_ua[test_ua-basic]
0.96s call     tests/test_core.py::test_devices[test_device-regex]
0.54s call     tests/test_core.py::test_ua[pgts_browser_list-regex]
0.26s call     tests/test_core.py::test_ua[firefox_user_agent_strings-basic]
0.18s call     tests/test_core.py::test_os[test_os-basic]
0.12s call     tests/test_core.py::test_ua[test_ua-regex]
0.03s call     tests/test_core.py::test_os[test_os-regex]
0.01s call     tests/test_core.py::test_os[additional_os_tests-basic]
0.01s call     tests/test_core.py::test_ua[firefox_user_agent_strings-regex]

So not only does it give these "native" performances, it's an even bigger gain than the re2 parser for cpython.