Support for raw app args

[sahil-lakhwani]

This PR adds ability for the recipe authors to patch raw app yamls by passing args
The args should follow a format of :
<kind>.<name>.<fieldPath>: <value>
where fieldPath is the path of the field to be patched

The value has to be typed - for example, string should be quoted.

Example:

apiVersion: v1
kind: kbrew
app:
  args:
    Deployment.nginx.spec.replicas: 4
    Deployment.nginx.spec.strategy.type: "RollingUpdate"
  repository:
    name: nginx
    url: https://raw.githubusercontent.com/Kurento/Kubernetes/master/nginx-deployment-service.yaml
    type: raw
  name: nginx
  namespace: "-"
  sha256:
  version: v0.10.1

Consists of #69 and #70 , so to be merged after them

[PrasadG193]

Please add a default case? What is the expected behavior if v.Type is not string? Should we fail here?

[sahil-lakhwani]

The yq library expects just the strings to be quoted.