Adds the support of CAM (for solids) and Hybrid-LDA functionals

Description

Adds the support of CAM and LDA hybrid functionals. At the moment the CAM hybrids are only implemented for the 3D-3D kernel.

The original implementation was done by Jiuyu Sun.

News snippet

Adds the support of CAM and LDA hybrid functionals

Checklist

• I have checked that my code follows the Octopus coding standards
• I have added tests for all the new features added in this request.