Merge implementations of Interval, Rectangle, and Brick

[nilsvu]

Proposed changes

I needed different boundary conditions in each direction in 2D, but it was only supported in 3D. Also, only the 1D domain supported log/inverse grid point distributions. So I merged the three implementations into one.

Upgrade instructions

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

[knelli2]

@nilsvu will rebase since this is something we want

[nilsvu]

@sxs-collaboration/spectre-core-devs could someone review this one? I rebased it and it's running through CI now.

[nilsdeppe]

I can review this

[nilsdeppe]

You can squash