Add support for PTZ service

[NickM-27]

No description provided.

[codecov]

Codecov Report

Merging #510 (ee95f3f) into dev (c150f9b) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               dev      #510   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           15        15           
  Lines         1881      1896   +15     
=========================================
+ Hits          1881      1896   +15     

Files Changed	Coverage Δ
custom_components/frigate/camera.py	100.00% <100.00%> (ø)
custom_components/frigate/const.py	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

[dermotduffy]

Overall looks great -- comments about the naming mostly.

[dermotduffy]

Thanks @NickM-27 !

[mjwood7]

@NickM-27 - thanks for taking on adding this enhancement.

Question: when testing frigate.ptz via the developer tools in HA, if I do a move left, the camera (reolink trackmix) will spin left all the way until it hits the mechanical limit. However, in the frigate console, if I click the left move arrow for the camera, it only steps left incrementally, which is the desired behavior. Is there a way to set the incremental behavior or otherwise get it to inherit the behavior from frigate?

[NickM-27]

you call the stop service in HA