fetch{url,zip}: use basename of URL without the query string as the default derivation name

[UlyssesZh]

This is intuitive because the query string makes the filename extension incorrect. Practically, it sometimes avoids using the extension argument of fetchzip. Example:

https://github.com/NixOS/nixpkgs/blob/5a6e073dad0d2c502a55c1db56cc6531f678081b/pkgs/by-name/ce/celeste-classic/package.nix#L20-L25

[Desel72]

Hi @UlyssesZh can I work on this issue as the first contribution for the repository?

[UlyssesZh]

Yeah feel free.

I am opening this issue mainly to ask people's opinions on whether we should do this though. You would've done unnecessary work if the answer is "no".