add functions that will be used for transparent init feature #5139
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Related: #4915
Description
This PR adds the functions that will be used to implement the transparent init feature.
The main functions here are the Transparent() function (could be named better), and the ConfirmInitOptions() prompt function.
There are also some new util functions defined in pkg/skaffold/initializer/util
Follow-up Work (remove if N/A)
Use these functions to implement transparent init