feat: add backstage catalog entity plugin

[levivannoort]

Fixes: amplication/amplication#8287

PR Details

The new plugin will be responsible for creating the yaml file by which the service can be registered and displayed in Backstage.

generated example

apiVersion: backstage.io/v1alpha1
kind: Component
metadata:
  name: Amplication-sample-application
  description: Sample application for testing
  labels:
    vendor: "amplication"
  annotations:
    github.com/project-slug: "backstage/backstage"
    github.com/team-slug: "backstage/maintainers"
  tags:
    - "Node.js"
  links:
    - url: https://app.amplication.com/ckl0ow1xj00763cjnch10k6mc
      title: Amplication Platform
spec:
  type: service
  lifecycle: production
  owner: development

[mulygottlieb]

/publish