Add log configuration functions

[dave-shawley]

This PR adds a new module that will build logging.config.dictConfig ready dictionaries for services and command-line applications. jsonscribe.get_service_configuration returns a dictionary that is wired to use JSON-based logging and jsonscribe.get_cli_configuration returns a similar dictionary that produces human-readable logs.

Both functions respond to the DEBUG and LOG_FORMAT environment variables. If DEBUG is set and determined to be truthy, then the root log level is set to debug instead of info (the default). The LOG_FORMAT environment variable can be set to either json or plain to explicitly select a format regardless of what the application has configured. The functions both support parameters that can be used to influence the decision as well though the options probably won't see much use.

[codecov]

Codecov Report

Merging #2 (2fe10fb) into main (cc5ea2e) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main        #2   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         5    +1     
  Lines           71       116   +45     
  Branches        11        19    +8     
=========================================
+ Hits            71       116   +45     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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Impacted Files	Coverage Δ
jsonscribe/__init__.py	100.00% <100.00%> (ø)
jsonscribe/config.py	100.00% <100.00%> (ø)
jsonscribe/utils.py	100.00% <100.00%> (ø)

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