build(aio): improve the API Pipe pages (#22702)

This change adds:

* an impure badge for Pipes that are marked as  `pure: false`
* a pipe specific overview that shows the syntax for using a pipe in a template.
* an "input value" section describing the type of the value that the pipe expects.
* a "pipe params" section describing any additional params that a pipe expects.

PR Close #22702

aio/tools/transforms/templates/api/pipe.template.html

@@ -1,5 +1,8 @@
 {% extends 'export-base.template.html' -%}
 
+{% block overview %}
+{% include "includes/pipe-overview.html" %}
+{% endblock %}
 {% block details %}
 {% include "includes/description.html" %}
 {% endblock %}