Implement new feature kpt cfg search(replace)

[phanimarupaka]

Implement the new feature kpt cfg search which will help users to effectively search for fields in the yaml configs.

• Search by value
• Search by value regex
• Put literal
• Add non-existing fields
• Support search by absolute paths
• Support path expressions
• Implement put pattern
• Fishfood
• Documentation

[phanimarupaka]

#248 is addressed with by this new feature and not with setters.

[mikebz]

copying the commentary from @bgrant0607 here #742 (comment)

This issue is the same as the one that motivated the analogous feature in kustomize.
https://github.com/kubernetes/enhancements/blob/master/keps/sig-cli/0008-kustomize.md#long-standing-issues

The tricky part is finding references, which can't be done via naive search and replace.
https://github.com/kubernetes-sigs/kustomize/blob/master/api/konfig/builtinpluginconsts/namereference.go

[phanimarupaka]

Search and Replace in kpt is more context aware of KRM resource files. That differentiates it from the native search and replace. It leverages syntax from yq to find the references.

[karlkfi]

How was this implemented? I don't see it in the kp v1 docs and none of the links here are to PRs that merged...

[karlkfi]

Ah, I see a function: https://catalog.kpt.dev/search-replace/v0.1/