Harmonic: Address some todos

[ahcorde]

🎉 New feature

Summary

Harmonic: Address some todos

Required gazebosim/gz-msgs#365

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[mjcarroll]

@ahcorde Is this blocked on another PR/branch? Builds are failing.

[ahcorde]

@mjcarroll I updated the gz-msgs PR and I create a new one in gz-sensor to resolve this comment gazebosim/gz-msgs#365 (comment)

• Added AirSpeedSensor msgs to Sensor msg gz-msgs#365
• Update air sensor with air_speed.proto gz-sensors#374

[ahcorde]

@osrf-jenkins run tests please!

[codecov]

Codecov Report

Merging #2054 (bb7b1ce) into main (f18626e) will decrease coverage by 0.03%.
The diff coverage is 11.11%.

❗ Current head bb7b1ce differs from pull request most recent head 4b1a89b. Consider uploading reports for the commit 4b1a89b to get more accurate results

@@            Coverage Diff             @@
##             main    #2054      +/-   ##
==========================================
- Coverage   65.50%   65.47%   -0.03%     
==========================================
  Files         314      314              
  Lines       29796    29814      +18     
==========================================
+ Hits        19517    19520       +3     
- Misses      10279    10294      +15     

Files Changed	Coverage Δ
src/systems/air_speed/AirSpeed.cc	76.34% <ø> (ø)
src/Conversions.cc	83.23% <11.11%> (-1.24%)	⬇️

... and 1 file with indirect coverage changes