Generic device widget, and StateDeviceWidget

[tlambert03]

a start on creating more generic widgets that work for given device types.

This establishes new base class DeviceWidget that accepts the name of a device and is expected to make widget that controls the device. In most cases, it will be created with the classmethod DeviceWidget.for_device('deviceLabel') which creates the appropriate subclass. Here, StateDevice is implemented... but for_device will raise a NotImplementedError for all other device types (to be implemented later).

[codecov]

Codecov Report

Merging #120 (ced46b0) into main (23994fe) will increase coverage by 0.70%.
The diff coverage is 98.14%.

❗ Current head ced46b0 differs from pull request most recent head 0b479a7. Consider uploading reports for the commit 0b479a7 to get more accurate results

@@            Coverage Diff             @@
##             main     #120      +/-   ##
==========================================
+ Coverage   74.92%   75.63%   +0.70%     
==========================================
  Files          19       20       +1     
  Lines        1715     1769      +54     
==========================================
+ Hits         1285     1338      +53     
- Misses        430      431       +1     

Impacted Files	Coverage Δ
micromanager_gui/_gui_objects/_device_widget.py	98.14% <98.14%> (ø)

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