Add 'Reset Desiccant' and desiccant frequency number input to Granary Smart Camera Feeder

[zendil]

Proposed change:

Adds functionality for a 'Reset Desiccant' button to the Granary Smart Camera Feeder. Largely copied from the non-camera feeder but with some bug fixes.
'Desiccant Frequency' number input also added to the camera feeder and bugfixed.

Closes #143

Type of change:

• New device.
• Bug fix (non-breaking change which fixes an issue).
• New feature or enhancement (non-breaking change which adds functionality).
• Documentation only.
• Other (please explain).

Checklist:

• If applicable, I have added corresponding documentation changes.
• If applicable, I have reviewed the feature / enhancement guidlines before submitting my request.
• If applicable, I have tested my code for new features & regressions on the latest version of Home Assistant.

Additional notes:

I did not modify base methods in the API, but of note a post request with data of None may be returned as None or {} depending on whether of not a token resync was performed. This is accounted for in set_desiccant_reset() and opened #200

I also did not change too much of what was already present in the api set_desiccant_reset() method but I am unsure when/where the response would be parsed and returned as an int - that block may be redundant. Other fragments in that method seemed to do json parsing that is now handled in the request method itself.

I did not poke around with the api itself at all, using a key parameter of "DESICCANT" for the set_desiccant_cycle() request seemed to produce desired results so I stopped there - not sure if there is an knowledge floating around somewhere of what that value is/does.

[C4-Dimitri]

@zendil , the "DESICCANT" key is used when the desiccant cycle being adjusted, you can also use the key "FILTER_ELEMENT" to the same endpoint to for example adjust the filter cycle for a fountain instead.

All go to the same endpoint in the API but with a key:

/device/device/maintenanceFrequencySetting

[jjjonesjr33]

Minor correction

[jjjonesjr33]

Let's give it a go