This commit replaces github.com/spf13/viper with github.com/knadh/koanf. Koanf is very similar library to viper, with less dependencies and several quality of life differences. This also allows most config options to be defined by ENV. Lastly it also enables the use of split configuration files which can be configured by setting the --config flag multiple times.
Co-authored-by: Amir Zarrinkafsh <nightah@me.com>
* [FEATURE] Config Validation
* check configuration for invalid keys on startup
* allow users to manually trigger all configuration validation on a file using a cmd
* setup all defaults in config template and run tests against it to prevent accidents
* use tests to check bad configuration values are caught
* use tests to check old configuration values are caught
* add tests for specific key errors
* resolve merge conflicts
* nolint prealloc for test
James Elliott