Extend image-stats tag endpoint to filter by image name

[zakkak]

I was looking for a way to get data only for a specific test from a specific tag (and at a later I would like to add date-based filters (my goal is to be able to get only newer entries than I have already fetched).

I considered creating a new endpoint but this doesn't seem to scale well, so I thought we could start extending some of our existing endpoints instead, so here is a draft for this.

The reason I opened this as a draft is because I am toying with the idea of extending the base endpoint api/v1/image-stats with query params to filter the data according to various options.

@Karm @jerboaa WDYT is the best way to go?

Note: This is related to Hyperfoil/Horreum#1703

[zakkak]

@jerboaa @Karm could you please have a look and give me some feedback?

[jerboaa]

@zakkak It seems the default GET entry point ought to get amended with a variety of query params. That would be a better fit than the get-all-by-tag entry point. The default, if there is no query param, it would return all stats as before.