feat: add backstage catalog entity plugin

plugins/backstage-catalog-entity/.amplicationrc.json

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+{
+  "settings": {
+    "labels": {
+      "vendor": "amplication"
+    },
+    "annotations": {
+      "github.com/project-slug": "backstage/backstage",
+      "github.com/team-slug": "backstage/maintainers"
+    },
+    "tags": [
+      "Node.js"
+    ],
+    "spec": {
+      "type": "service",
+      "lifecycle": "production",
+      "owner": "development"
+    }
+  },
+  "systemSettings": {
+    "requireAuthenticationEntity": "false"
+  }
+}

plugins/backstage-catalog-entity/.gitignore

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+# See http://help.github.com/ignore-files/ for more about ignoring files.
+
+# compiled output
+dist
+**/dist/
+tmp
+/out-tsc
+
+# dependencies
+node_modules
+**/node_modules/
+
+# IDEs and editors
+/.idea
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# IDE - VSCode
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+*.code-workspace
+
+# Local History for Visual Studio Code
+.history/
+
+# Common credential files
+**/credentials.json
+**/client_secrets.json
+**/client_secret.json
+*.dat
+*.httr-oauth*
+
+# Terraform development
+**/.terraform.lock.hcl
+**/.terraform
+**/terraform.tfstate
+**/terraform.tfstate.backup
+
+# misc
+/.sass-cache
+/connect.lock
+**/coverage/
+/libpeerconnection.log
+npm-debug.log
+yarn-error.log
+testem.log
+/typings
+
+
+# System Files
+.DS_Store
+Thumbs.db
+
+.nx/cache
+
+.env.local

plugins/backstage-catalog-entity/.npmignore

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+.prettierignore
+.gitignore

plugins/backstage-catalog-entity/.prettierignore

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+dist