feat: add version to command line interface

[alexander-held]

The CLI did not support cabinetry --version so far, so this is added here via built-in click functionality.

* add support for cabinetry --version to the command line interface

[codecov]

Codecov Report

Merging #350 (cde2164) into master (b8cca68) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #350   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           23        23           
  Lines         1901      1903    +2     
  Branches       303       303           
=========================================
+ Hits          1901      1903    +2     

Impacted Files	Coverage Δ
src/cabinetry/cli/__init__.py	100.00% <100.00%> (ø)

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