This is in response to issue #17473.
Not all the necessary handlers to deal with media requests are started
now when configuring synapse to use a media worker as per the [example
config](https://element-hq.github.io/synapse/latest/workers.html#synapseappmedia_repository).
The new media endpoints introduced with authenticated media fall under
the `client` & `federation` handlers in synapse.
This PR starts up handlers for the new media endpoints if a worker has
been configured with only the `media` resource type.
### Pull Request Checklist
<!-- Please read
https://element-hq.github.io/synapse/latest/development/contributing_guide.html
before submitting your pull request -->
* [X] Pull request is based on the develop branch
* [x] Pull request includes a [changelog
file](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#changelog).
The entry should:
- Be a short description of your change which makes sense to users.
"Fixed a bug that prevented receiving messages from other servers."
instead of "Moved X method from `EventStore` to `EventWorkerStore`.".
- Use markdown where necessary, mostly for `code blocks`.
- End with either a period (.) or an exclamation mark (!).
- Start with a capital letter.
- Feel free to credit yourself, by adding a sentence "Contributed by
@github_username." or "Contributed by [Your Name]." to the end of the
entry.
* [X] [Code
style](https://element-hq.github.io/synapse/latest/code_style.html) is
correct
(run the
[linters](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#run-the-linters))
---------
Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>
