v0.4.0

• Take cause exception as a normal argument on Logger methods, instead of as a property on LogBuilder
  • This makes the normal case of logging a message along with an exception more concise
• Use SLF4J's MDC for logging context instead of a custom thread-local
  • This allows our logging context to also apply to logs by libraries that use SLF4J
  • A new LoggingContextJsonFieldWriter is provided for Logback to enable JSON fields in MDC
• Rename LogBuilder methods to be more concise and intuitive
  • addField and addRawJsonField are now just field and rawJsonField, like their top-level counterparts
  • addPreconstructedField is now addField
• Add LogBuilder.addFields method to make it easier to pass a list of pre-constructed fields
• Add ExecutorService.inheritLoggingContext extension function to make it easier to inherit logging context in tasks submitted to an ExecutorService
• Add more constructor overloads to ExceptionWithLogFields, to allow passing log fields with less boilerplate
• Fix edge case of unquoted strings being allowed by rawJsonField
• Improve documentation