Add Huawei LTE reauth flow

[scop]

Proposed change

Adds reauth support to Huawei LTE.

Type of change

• [ ] Dependency upgrade
• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New integration (thank you!)
• [x] New feature (which adds functionality to an existing integration)
• [ ] Deprecation (breaking change to happen in the future)
• [ ] Breaking change (fix/feature causing existing functionality to break)
• [ ] Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• [x] The code change is tested and works locally.
• [x] Local tests pass. Your PR cannot be merged unless tests pass
• [x] There is no commented out code in this PR.
• [ ] I have followed the development checklist
• [x] The code has been formatted using Black (black --fast homeassistant tests)
• [x] Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• [ ] Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• [ ] The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• [ ] New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• [ ] For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
• [ ] Untested files have been added to .coveragerc.

The integration reached or maintains the following Integration Quality Scale:

• [ ] No score or internal
• [ ] 🥈 Silver
• [ ] 🥇 Gold
• [ ] 🏆 Platinum

To help with the load of incoming pull requests:

• [ ] I have reviewed two other open pull requests in this repository.

[probot-home-assistant[bot]]

Hey there @fphammerle, mind taking a look at this pull request as it has been labeled with an integration (huawei_lte) you are listed as a code owner for? Thanks! _{^{(message by CodeOwnersMention)}}

[scop]

Not sure what's up with codecov. The service view takes a long time to load, errors most of the time. And local run says:

$ pytest --cov=homeassistant.components.huawei_lte tests/components/huawei_lte
Test session starts (platform: linux, Python 3.9.0, pytest 7.1.3, pytest-sugar 0.9.5)
rootdir: /home/scop/Documents/code/home-assistant, configfile: pyproject.toml
plugins: rerunfailures-10.2, mock-3.6.1, aiohttp-0.3.0, freezegun-0.4.2, test-groups-1.0.3, forked-1.4.0, timeout-2.1.0, xdist-2.5.0, socket-0.5.1, cov-3.0.0, anyio-3.6.1, sugar-0.9.5, respx-0.19.2, requests-mock-1.10.0
collecting ... 
 tests/components/huawei_lte/test_config_flow.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓ 50% █████     
                                                 ✓✓               56% █████▋    
 tests/components/huawei_lte/test_device_tracker.py ✓✓✓✓✓         72% ███████▎  
 tests/components/huawei_lte/test_sensor.py ✓✓✓                   81% ████████▎ 
 tests/components/huawei_lte/test_switches.py ✓✓✓✓✓✓             100% ██████████

----------- coverage: platform linux, python 3.9.0-final-0 -----------
Name                                                 Stmts   Miss  Cover
------------------------------------------------------------------------
homeassistant/components/huawei_lte/config_flow.py     144      0   100%
homeassistant/components/huawei_lte/const.py            36      0   100%
homeassistant/components/huawei_lte/utils.py            10      0   100%
------------------------------------------------------------------------
TOTAL                                                  190      0   100%


Results (2.91s):
      32 passed