Add Config flow to august

[bdraco]

Breaking change

Proposed change

Convert august to config flow

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

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request: Add config flow to august home-assistant.io#12172

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

[bdraco]

This is on top of #32125

[codecov]

Codecov Report

Merging #32133 into dev will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev   #32133      +/-   ##
==========================================
+ Coverage   94.74%   94.75%   +0.01%     
==========================================
  Files         767      768       +1     
  Lines       55498    55644     +146     
==========================================
+ Hits        52581    52727     +146     
  Misses       2917     2917

Impacted Files	Coverage Δ
homeassistant/generated/config_flows.py	100% <ø> (ø)	⬆️
homeassistant/util/dt.py	95.36% <0%> (-4.12%)	⬇️
...meassistant/components/mqtt/vacuum/schema_state.py	91.13% <0%> (-0.59%)	⬇️
...istant/components/homekit_controller/connection.py	92.73% <0%> (-0.09%)	⬇️
homeassistant/components/buienradar/camera.py	96.34% <0%> (-0.05%)	⬇️
homeassistant/components/twitch/sensor.py	96.7% <0%> (-0.04%)	⬇️
homeassistant/components/demo/media_player.py	95.67% <0%> (-0.03%)	⬇️
homeassistant/components/device_tracker/legacy.py	99.14% <0%> (-0.01%)	⬇️
homeassistant/components/rflink/light.py	100% <0%> (ø)	⬆️
homeassistant/components/darksky/sensor.py	96.81% <0%> (ø)	⬆️
... and 63 more

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[bdraco]

That should resolve all review comments