Make SimpliSafe entities unavailable when wifi is lost

[bachya]

Proposed change

This PR updates the SimpliSafe integration to watch for loss (and restoration) of wifi connection to the base station; upon seeing these events, SimpliSafe entities are marked/unmarked unavailable. Additionally, the PR removes checking online/offline status via the REST API (since the above events now do the same job).

Type of change

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

Example entry for configuration.yaml:

# Example configuration.yaml
simplisafe:
  accounts:
    - username: !secret simplisafe_username
      password: !secret simplisafe_password

Additional information

• This PR fixes or closes issue: N/A
• This PR is related to issue: N/A
• Link to documentation pull request: N/A

Checklist

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

The integration reached or maintains the following Integration Quality Scale:

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

[codecov]

Codecov Report

Merging #32154 into dev will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev   #32154      +/-   ##
==========================================
+ Coverage   94.73%   94.74%   +0.01%     
==========================================
  Files         767      772       +5     
  Lines       55486    55864     +378     
==========================================
+ Hits        52562    52931     +369     
- Misses       2924     2933       +9

Impacted Files	Coverage Δ
...istant/components/google_assistant/report_state.py	83.33% <0%> (-1.67%)	⬇️
homeassistant/components/alexa/state_report.py	83.63% <0%> (-0.63%)	⬇️
...meassistant/components/mqtt/vacuum/schema_state.py	91.13% <0%> (-0.59%)	⬇️
homeassistant/components/twitch/sensor.py	96.7% <0%> (-0.04%)	⬇️
homeassistant/components/rflink/light.py	100% <0%> (ø)	⬆️
homeassistant/components/darksky/sensor.py	96.81% <0%> (ø)	⬆️
homeassistant/components/mqtt/fan.py	97.96% <0%> (ø)	⬆️
homeassistant/components/withings/const.py	100% <0%> (ø)	⬆️
homeassistant/components/mqtt/binary_sensor.py	100% <0%> (ø)	⬆️
homeassistant/components/almond/config_flow.py	100% <0%> (ø)	⬆️
... and 60 more

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