Heat equation tutorial with pyamrex

[EZoni]

Thank you to @RevathiJambunathan, @oshapoval, @dpgrote, @kngott and @ax3l for the teamwork.

Rewrite the "HeatEquation" guided tutorial using pyamrex.

This depends on:

• adding wrapper for AMREX_D_DECL pyamrex#150
• Wrapper for writing single level plotfile pyamrex#153
• Wrapper for FillBoundary pyamrex#154
• Add keyword args to MultiFab copy methods pyamrex#155

To-do:

• Validate results (pyamrex vs C++)
• Generalize numpy with cupy (CPU -> CPU, CUDA, HIP)

Follow-up ideas:

• Use ParmParse to read input parameters
• Make code dimension-agnostic as original C++ tutorial

Visualization of plotfile data produced with pyamrex, using yt:

Comparison of plotfile data produced with pyamrex and C++, using ParaView, at step=100:

[ax3l]

reopening for CI update from #97

[ax3l]

@EZoni just FYI, I rebased this on main to include updates from #95

[ax3l]

@EZoni @atmyers @RevathiJambunathan this is also ready for review :)

[ax3l]

@EZoni @atmyers @RevathiJambunathan ping :)