API endpoint for stream specific searching

Currently when you want to search messages in a specific stream, you use for example the /search/universal/absolute endpoint to search, but you need to add 'streams:' to the filter.

## Expected Behavior
It would be absolutely lovely to have an endpoint along the lines of /search//absolute that does not require the filter field to contain the filter on stream, mostly as an "ease of use" case for devs that utilise the API and often tend to forget to add the filter parameter.