[Standalone] Add YAML support for application creation

[Piumal1999]

Purpose

Providing the ability to create the devportal applications through a yaml structure
Fixes https://github.com/wso2-enterprise/apim-saas/issues/2376

Approach

Update the /application POST and PUT endpoints to accept yaml files with the following format:

apiVersion: devportal.wso2.com/v1alpha1
kind: Application
metadata:
  name: payments-app
spec:
  displayName: PaymentsApp
  description: Client app for payment APIs
  // any other properties can be supported later

Samples

N/A

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