[META] Document all views plugins types

This is sort of a duplicate of part of the scope defined in #1856544: [META] Views documentation improvements, but let's use it as a sub-issue. From that issue:

While views.api.php has been updated to Drupal 8, basic explanations for handler plugin types are missing.

All base plugins and handlers need significantly more documentation.

This is also the sort of docs issue that we can allow now, since it's critical documentation. (In fact "Basic API docs for all base plugins & important objects complete" is on our D8 goals chart for Feb. 18).

Let's make this an easier novice task by creating sub-issues for each base plugin. To help with this issue:

1. Look in the core/modules/views/lib/Drupal/views/Plugin/views directory.
2. There is a sub-directory for each plugin type:
   • access
   • area
   • argument
   • argument_default
   • argument_validator
   • cache
   • display
   • display_extender
   • exposed_form
   • field
   • filter
   • join
   • pager
   • query
   • relationship
   • row
   • sort
   • style
   • wizard

   Pick one of these plugin types and create an issue for it. Link the issue here, in this issue's summary.

3. In the directory for your plugin type, there will be a base plugin. Create a patch to add documentation to the documentation block for the class.
4. See #1871762-3: Add detailed documentation explaining the block system's architecture for an example of how an abstract base plugin can be documented.
5. Start by making a list of all the plugin annotation keys that are available. You can get an idea of what they are by looking at individual plugins within the same directory.
6. Make sure the plugin has an @ingroup reference to the group for its plugin or handler type (defined on the base plugin), and that it is at the end of the class docblock.
7. Try to add an explanation paragraph to the docblock above your list of annotation keys that explains how that plugin type can be used. See views.api.php for some starting point information. The VDC team can also help you with this part.

Two more advanced but very important tasks would be to add such documentation to PluginBase and HandlerBase.

I've started work on the pager directory in #1912650: Document all views pager plugins types.

How did I delete the tags?

I've started work on the access directory in #1912658: Document views access plugins.

I think this can be marked as fixed now, or as a duplicate of #2216539: Fill in @defgroup/topic docs for Views overview?