improvement: add base class for hass discovery

[AndreasBoehm]

I started to refactor how we build hass discovery as an outcome of this comment: #1136 (comment)

My idea is to create MqttHassPublisher as a library with static methods that can be used to publish sensors, buttons, fields and helpers like createDeviceInfo.

[AndreasBoehm]

@schlimmchen I already added createDeviceInfo and publish as an example in this MR to check with you if i am going into the right direction.

[AndreasBoehm]

I also added publishBinarySensor2 in MqttHandleBatteryHassClass as a start to get the publish*Sensor methods into the library. Its a rough draft but it would be great if you can give your input on that method as well.

To make it work with even less code we would need to change MqttHassPublisher (with a better name of course) to be the base class for all MqttHandle*HassClass-es and make them implement a couple of methods like configTopicPrefix(), uniqueIdentifier() and deviceInfo() that we can then use inside publish*Sensor without repeating the same code over and over.

I would also suggest a strategy switch to type sensorIds manually instead of generating them from the caption, this will also allow us to rename captions without breaking the hass entities.

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