title: google-cloud-datacatalog 0.8.0 is missing TagTemplate option
body: <p>I am working on developing a datacatalog integration pipeline in google cloud composer. Since I am using composer version composer-1.12.4-airflow-1.10.10, its not allowing me to install google-cloud-datacatalog version 3 or above at the same time its allowing only 0.8.0 or below. This is because an internal conflict. When I tried to use version 0.8.0, while creating TagTemplate object, its giving a <strong>TagTemplate</strong> Not Found exception. So I am left with an option to upgrade the composer, which is very difficult at this point, since I need to test the compatibility of more than 200 existing pipelines. Is there any other option programatically I can tackle this using the 0.8.0 version.</p>
  <p>Here is an excerpt of my module:</p>
  <pre><code>from google.cloud import datacatalog
          
  dc_client = datacatalog.DataCatalogClient()
  tag_template = datacatalog.TagTemplate() &lt;Here is I am getting the not found error&gt;
  </code></pre>
  <p><a href="https://i.stack.imgur.com/ecZus.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ecZus.png" alt="enter image description here" /></a></p>