logging: add a LogConfig class and parsing code
Summary: Add a new LogConfig class to represent the current configuration state of the LoggerDB. This also includes code to parse config strings in both JSON and a simpler more human-writable format (intended primarily for use in command line arguments). I generally expect the human-writable format to be used mainly to configure log levels. It also supports configuring log handler details as well, but the format for this data is slightly more cumbersome and will probably be harder for people to easily remember. The parsing code is intentionally kept as part of the 'init' library rather than the core 'logging' library so that other libraries that simply wish to log messages do not need to depend on it. For instance, this would allow the folly JSON library to use the logging library without causing a circular dependency. Reviewed By: bolinfest Differential Revision: D6200560 fbshipit-source-id: e4e3c7f941808251b6c7bcbbdac0210118675fb0
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