Controller firmware overhaul (part 1)

[calvinmclean]

Description

I am working on overhauling the controller firmware to be more easy to setup, update, and configure. Ultimately, the goal is to have a single firmware binary that is separate from a user's configuration. You should be able to download the binary file, put it on an ESP32, and then connect to WiFi and MQTT using a captive portal. Then, you can create a config in the UI and publish to the controller.

Part 1, this PR, includes:

• WifiManager library is used for captive portal setup for WiFi and MQTT. It also provides manual OTA uploads
• Remove extra firmware features that complicate things
  • Moisture sensors
  • Buttons
  • Extra options for health and other features that don't need to be changed
• Simplify config overall to prepare for JSON
• Add test project for developing and testing config format and filesystem
• Add mDNS to easily connect to WifiManager portal without IP address

Next, I will need:

• New config or firmware either as part of a Garden or as a child resource in the API (/gardens/{gardenID}/config)
• Update controller to use config JSON and load it from MQTT
  • Before config is received, it should just listen on the one topic and publish health messages
• The server should be able to notify the controller of new firmware (over MQTT) so the controller can download from a Github release (this is probably part 3)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.33%. Comparing base (1f7e538) to head (02a8b1e).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #179      +/-   ##
==========================================
+ Coverage   76.87%   77.33%   +0.45%     
==========================================
  Files          63       63              
  Lines        3650     3529     -121     
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- Hits         2806     2729      -77     
+ Misses        602      561      -41     
+ Partials      242      239       -3     

Components	Coverage Δ
garden-app	77.33% <100.00%> (+0.45%)	⬆️