All cocal implementation

[MaiLi-UIUC]

Proposed changes

This pull request introduces a COCAL initial data reader into SpECTRE, enabling simulations to use initial data generated by the COCAL code.

Upgrade instructions

No upgrade instructions are necessary.

Code review checklist

• The code is documented and the documentation renders correctly. Run
  make doc to generate the documentation locally into BUILD_DIR/docs/html.
  Then open index.html.
• The code follows the stylistic and code quality guidelines listed in the
  code review guide.
• The PR lists upgrade instructions and is labeled bugfix or
  new feature if appropriate.

Further comments

The procedure to use the COCAL initial data is:

1. Run export COCAL_ROOT=/Path/To/Main/SpECTRE/Directory/src/PointwiseFunctions/AnalyticData/GrMhd/COCAL_reader
2. Build SpECTRE and executable as always.
3. In the Input file, specify these three options:
   InitialData:
   CocalInitialData:
   DataDirectory: "/Path/To/The/Cocal/Initial/Data"
   IdType: (Choose from "Ir", "Co" and "Sp")
   ElectronFraction:
4. In the submit.sh file, change ++ppn to +ppn and submit.