[WIP] Expose BoomerAMG options

[victorapm]

This PR adds the following BoomerAMG calls to HyprePreconditioner.cpp for fine-tuning purposes:

1. HYPRE_BoomerAMGSetNumPaths
2. HYPRE_BoomerAMGSetAggInterpType
3. HYPRE_BoomerAMGSetRelaxWt
4. HYPRE_BoomerAMGSetPMaxElmts

In addition, new enums are defined for the interpolation types.

TODOs:

• [x] Update meaning of logLevel values for the linear solver?

0. No info about solver statistics
1. Linear solver iterations, timings and final residual norm
2. All info from 1 plus preconditioner statistics
3. All info from 1 plus convergence history
4. All info from 1, 2, and 3.

• [ ] Add enum for coarsening type?
• [ ] Update documentation
• [ ] Handle the other LAIs