Feature/p8 sensor logger

[renereimann]

Implementation of a sensor logger matching the database layout of project8.
The endpoint_name is used to check in the id_map table which type of data the endpoint is.
In a second step the correct table is selected and data are inserted.

[wcpettus]

I attempted to tighten this by tweaking the base PostgresSensorLogger base class to add a bit of flexibility, then making a Mapped Logger class that could inherit expand on it (doing essentially the same thing). That lives over in dl-py:
driplineorg/dripline-python#223

My reasoning was:

• ADMX and various P8 setups want something like this, so there's demand for the expansion
• This method reduces code duplication for easier maintenance

Comments should follow of whether this was a good idea or not, but now the PRs are linked.