Requirements

With #206, flagd now has the ability to support yaml formatted flag configurations.

However, to use yaml evaluation, users should use -e, --evaluator string set to .yaml or .yml even if the flag configuration file contains the correct extension.

To enhance the user experience, flag format can be detected from the file extension and omit the requirement of evaluator string parameter.

This simplifies, flagd start -e yaml -f example_flags.yaml command to flagd start -f example_flags.yaml.