Client API: /get_files/search_files - Return quantity instead of list of files

[cinnamon-rolls]

Add an argument to the /get_files/search_files endpoint, which is named something to the effect of return_only_quantity

When this argument is set to true, instead of returning a big list of file IDs, it instead returns the length of the list it would have returned.

For example, instead of sending

[1,2,42,132,1000]

it sends

5

Motivation

I can use this in my 3rd party app to optimize cases where I just want to show how many pending files there are. Querying 10k files and sending them in a big JSON dump just to call len() and abandon it all to the garbage collector isn't ideal

[dergness]

In that case a route named /get_files/count_files could make sense? It would take the same arguments, and would result in the same database filters, but could instead do a SELECT count(*) ... on it instead SELECT * ... (or similar)