Search by provides in RPC interface

[Guillaume Benoit]

Hi,
knowing you already added the possibility to search by depends, 
optdepends, makedepends and checkdepends in the AUR RPC interface, could 
you think about also add the possibility to search by provides:
https://aur.archlinux.org/rpc/?v=5&type=search&by=provides&arg=<keyword>

It could be very useful for AUR helpers to solve AUR dependencies this way.

If you point me to the relevant code, I can try to provide a patch.

Regards,
Guillaume.