Feature Request: custom HTML/javascript rendering of query results

I seek a way the user could configure the UI to render (selected) columns

Specifically my use cases are:
- render paths as clickable URLS
- render URLs to images as images with a given height (e.g. using a [URI template](https://en.wikipedia.org/wiki/URI_Template)) or sprintf `""`

I expect the most general approach would be to support specifying a javascript callback to post-process query results.

Or, possibly more simply, an "extension" working similarly to https://datasette.io/plugins/datasette-render-image-tags

The issue names no files, tests, or entry points. Start by locating the UI's query-result rendering path and comparing the linked Datasette image-rendering extension; done should include a defined configuration model for selected-column rendering and verified link or image output.

Written by the indexing model from the issue text.