WISH: IOC & OPI for Lakeshore 370 AC Resistance Bridge

As a WISH scientist I want to be able to control a Lakeshore 370 resistance bridge, so that I can measure and control the temperature in my experiments.

#### Acceptance Criteria
1. Using the IBEX client, I can control a Lakeshore 370 resistance bridge
1. Using genie_python, I can control a Lakeshore 370 resistance bridge

#### Notes
1. Check the [WISH Instrument wiki](https://github.com/ISISComputingGroup/IBEX/wiki/WISH-Instrument-Details).
1. The manufacturer's web-site describes the [Lakeshore 370](https://www.lakeshore.com/products/categories/overview/discontinued-products/discontinued-products/model-370-ac-resistance-bridge-).
* Note: the 370 model is now discontinued. The model 372 is its replacement.
1. A copy of the Lakeshore 370 manual is located here: \\isis\shares\ISIS_Experiment_Controls\Manuals\Lakeshore__temperature_controller\Model 370.
1. There appears to be no existing Lakeshore 370 VI. Aim to provide similar functionality to existing Lakeshore IOCs/OPIs (see models 336, 340, 350 and 372).
1. There is an EPICS support module for the Lakeshore 370 device at [EPICS Hardware Support](https://epics-controls.org/resources-and-support/modules/hardware-support/).