feat: add template variables CreatedResource, UpdatedResources, DeletedResources and ReplacedResources

[suzuki-shunsuke]

As a summary of the result of terraform plan, it is convenient to show a list of resource paths.

• .CreatedResources: a list of created resource paths ([]string)
• .UpdatedResources: a list of updated resource paths ([]string)
• .DeletedResources: a list of deleted resource paths ([]string)
• .ReplacedResources: a list of replaced resource paths ([]string)

Example

        {{if .CreatedResources}}
        * Create
        {{- range .CreatedResources}}
          * {{.}}
        {{- end}}{{end}}{{if .UpdatedResources}}
        * Update
        {{- range .UpdatedResources}}
          * {{.}}
        {{- end}}{{end}}{{if .DeletedResources}}
        * Delete
        {{- range .DeletedResources}}
          * {{.}}
        {{- end}}{{end}}{{if .ReplacedResources}}
        * Replace
        {{- range .ReplacedResources}}
          * {{.}}
        {{- end}}{{end}}

* Create
  * null_resource.foo
* Update
  * mysql_database.bar
* Delete
  * null_resource.bar
* Replace
  * mysql_database.foo