ACU: support commanding of HVAC systems

[mhasself]

Description

Adds a task to change states of Fans, Boosters, and Heater.

Motivation and Context

Need to change these. Due to changes in commanding (#1055), it's not easy to run shell scripts that command the ACU for this purpose, as the Agent effectively locks out other http command connections.

How Has This Been Tested?

Tested extensively in simulator and also on the LAT a few weeks ago. Commanding this fields is somewhat unreliable, which is not completely understood; but the present changes are unlikely to degrade normal performance of the Agent, even if a few tweaks are going to be needed going forward.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[BrianJKoopman]

Just a quick comment here that if you merge in the latest main (or rebase before review) that should fix the failing docs build.

[BrianJKoopman]

Looks good, just one question about the target names. Will wait until the group of #1085, #1086, and #1087 are all ready before merging.