new init prompt function and helper functions

[MarlonGamez]

Related: #4915

Description
This PR adds the functions that will be used to implement the transparent init feature.
The main is the ConfirmInitOptions() prompt function.

There are also some new util functions defined in pkg/skaffold/initializer/util

Follow-up Work
Use these functions to implement transparent init

[codecov]

Codecov Report

Merging #5141 (bec4398) into master (35e1bf9) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5141      +/-   ##
==========================================
+ Coverage   72.14%   72.20%   +0.05%     
==========================================
  Files         381      382       +1     
  Lines       13565    13589      +24     
==========================================
+ Hits         9787     9812      +25     
+ Misses       3061     3060       -1     
  Partials      717      717              

Impacted Files	Coverage Δ
pkg/skaffold/initializer/prompt/prompt.go	27.45% <100.00%> (+27.45%)	⬆️
pkg/skaffold/initializer/util/util.go	100.00% <100.00%> (ø)
pkg/skaffold/deploy/helm/deploy.go	71.77% <0.00%> (+0.27%)	⬆️
pkg/skaffold/runner/runcontext/context.go	84.61% <0.00%> (+1.28%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 35e1bf9...bec4398. Read the comment docs.

[IsaacPD]

Looks good just thought this function might be useful since I used it for the same use case so I think it could help here too by using it as the underlying function. It just uses the yaml that deploy *latest.DeployConfig unmarshals to, to get the list of deployers.

skaffold/pkg/skaffold/instrumentation/meter.go

Line 87 in d781368

meter.Deployers = yamltags.GetYamlTags(config.Deploy.DeployType)

skaffold/pkg/skaffold/yamltags/tags.go

Lines 80 to 92 in 1f200b1

	// GetYamlTags returns the tags of the non-nested fields of the given non-nil value
	// If value interface{} is
	// latest.DeployType{HelmDeploy: &HelmDeploy{...}, KustomizeDeploy: &KustomizeDeploy{...}}
	// then this parses that interface as it's raw yaml:
	// kubectl:
	// manifests:
	// - k8s/*.yaml
	// kustomize:
	// paths:
	// - k8s/
	// and returns ["kubectl", "kustomize"]
	// empty structs (e.g. latest.DeployType{}) when parsed look like "{}"" and so this function returns []
	func GetYamlTags(value interface{}) []string {

[IsaacPD]

Also now realizing there's a tab right before kubectl in the comment that shouldn't be there 😅

[MarlonGamez]

thanks for sharing this, I think your function is probably what I should use here because it should be fine in the case of a new deployer being added to skaffold