Update Plugin Presentation documentation with list of available widgets for use in plugins

Description

There is good amount of widgets that we have added to our UI that we haven't documented for plugin developers to use.

Current documentation - https://cdap.atlassian.net/wiki/spaces/DOCS/pages/480379311/Plugin+Presentation#Plugin-Widgets

Widgets Map in the Code

https://github.com/cdapio/cdap/blob/develop/cdap-ui/app/cdap/components/AbstractWidget/AbstractWidgetFactory.tsx#L128

Release Notes

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Assignee

Robin Rielley

Reporter

Ajai Narayanan

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