Fix register features

[tarockey]

• For issues:
  • FeathrClient.register_features() does not raise error when build_features() has not been called. #84
  • FeathrClient.register_features() only registers features from first auto_generated_*.conf in feature_conf folder #86
• Updates FeathrClient and _feature_registry to appropriate raise RuntimeErrors
• Updates _feature_registry to handle multiple .conf files in a single folder (as generated by build_features)
• Formatted templated .conf files to be more human readable
• Small formatting adjustments

[xiaoyongzhu]

Thanks for the PR! The test is failed because credentials are not spread to forked repo (will fix that hopefully soon), and others are all good to me. I've approved the changes and wait for @hangfei and @jaymo001 for their input on the string format changes.

[tarockey]

Thanks for the PR! The test is failed because credentials are not spread to forked repo (will fix that hopefully soon), and others are all good to me. I've approved the changes and wait for @hangfei and @jaymo001 for their input on the string format changes.

No problem! Should I try and merge into a different branch so that the tests can be run before merging into main?

[jaymo001]

LGTM. Great work!

[xiaoyongzhu]

@tarockey Thanks for the PR! I just merged it.