Created model class and a jupyter notebook to test it

In the jupyter notebook you can see the ADAM reporting all analog input channels. All of them report -10V except for channel 5, which the pressure sensor is connected to

https://github.com/lsst-ts/ts_pressureSensor/blob/master/python/lsst/ts/pressureSensor/Untitled.ipynb

(In this notebook I also tried opening 2 connections to the same device to see if they step on each other)

I am going to rework this CSC somewhat so that we can configure any combination of thermometers or pressure sensors  per ADAM device, so some of this work will be revisited

Please create a PR for code review. Things should be on branches and getting merged to develop, looks like you're working straight off master. 

I see the notebook is living with the codebase which is a little odd. There is probably a better place for that? Maybe Tiago Ribeiro can mention whatever the precedent is. Filename also needs a fix.

Two suggestions, move notebook to the "examples" (https://github.com/lsst-ts/ts_pressureSensor/tree/master/examples) folder or create a "notebooks" folder in the root of the package. 

Notebook will likely need some "import" statements to work. 

I also suggest reverting the commits done to master, adding the changes to a branch (tickets/DM-24447) and make a PR (to develop). 

Nearly all items in PR addressed.

One bug slipped through that's being fixed in DM-24775.