feat: convert the output error to yaml

[abdalazizmoh]

Hi 👋

This PR is for converting Json error output to Yaml format to be more readable

Build the tool

go build -o 'dist/kubeconformvalidator' .

Testing using /example directory :

kustomize build --enable-alpha-plugins --enable-exec ./example

The output display in Yaml format:

2023/05/17 20:32:03 Kubeconform validation failed: resources:
- filename: stdin
  kind: Service
  msg: 'problem validating schema. Check JSON formatting: jsonschema: ''/spec/ports/0/port''
    does not validate with https://raw.githubusercontent.com/yannh/kubernetes-json-schema/master/master-standalone/service-v1.json#/properties/spec/properties/ports/items/properties/port/type:
    expected integer, but got string'
  name: validated-core-resource
  status: statusInvalid
  validationErrors:
  - msg: expected integer, but got string
    path: /spec/ports/0/port
  version: v1
: failed to process results
Error: couldn't execute function: exit status 1 

Thanks

[aabouzaid]

Closing this in favor of #2