restructure/clean up extract
subcommand and extract pkg/yamlquery
#151
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This removes unneeded print statements from
registry-experimental extract
and pulls the yaml querying functions out into a separate package so they can be easily reused (I had already copied them into an external project and this will replace that copied code).The purpose of
pkg/yamlquery
is to make it easy to pull values out of YAML structures created by the yaml/v3 package. There might be other packages that do this, but I didn't see them, and this is lightweight and easy to modify (and we can toss it if we do find a replacement).I created an issue for testing the new package (#152).