Improve definition of @apply_regionally

[giordano]

By interpolating the function names we can call this macro also from other modules.

[giordano]

Very timely merge, I was looking for the definition of this macro again right now, having the link in my inbox was quite useful 😂

[glwagner]

ahaha I was getting errors. But actually it didn't solve it 😢

[glwagner]

example:

ERROR: LoadError: TypeError: in Type, in parameter, expected Int64, got a value of type Reactant.TracedRNumber{Int64}
Stacktrace:
  [1] Val
    @ ./essentials.jl:874 [inlined]
  [2] macro expansion
    @ ~/Projects/Oceananigans.jl/src/Utils/multi_region_transformation.jl:233 [inlined]
  [3] macro expansion
    @ ~/Projects/Oceananigans.jl/src/Models/HydrostaticFreeSurfaceModels/SplitExplicitFreeSurfaces/compute_slow_tendencies.jl:144 [inlined]
  [4] macro expansion
    @ ~/Projects/Oceananigans.jl/src/Utils/multi_region_transformation.jl:250 [inlined]
  [5] compute_free_surface_tendency!
    @ ~/Projects/Oceananigans.jl/src/Models/HydrostaticFreeSurfaceModels/SplitExplicitFreeSurfaces/compute_slow_tendencies.jl:143 [inlined]
  [6] compute_free_surface_tendency!(none::LatitudeLongitudeGrid{…}, none::HydrostaticFreeSurfaceModel{…}, none::SplitExplicitFreeSurface{…})
    @ Reactant ./<missing>:0
  [7] getproperty
    @ ./Base.jl:37 [inlined]
  [8] compute_free_surface_tendency!
    @ ~/Projects/Oceananigans.jl/src/Models/HydrostaticFreeSurfaceModels/SplitExplicitFreeSurfaces/compute_slow_tendencies.jl:132 [inlined]
  [9] call_with_reactant(::typeof(Oceananigans.Models.HydrostaticFreeSurfaceModels.compute_free_surface_tendency!), ::LatitudeLongitudeGrid{…}, ::HydrostaticFreeSurfaceModel{…}, ::SplitExplicitFreeSurface{…})
    @ Reactant ~/.julia/packages/Reactant/aXRlU/src/utils.jl:0
 [10] ab2_step!
    @ ~/Projects/Oceananigans.jl/ext/OceananigansReactantExt/TimeSteppers.jl:90 [inlined]
 [11] #time_step!#1
    @ ~/Projects/Oceananigans.jl/ext/OceananigansReactantExt/TimeSteppers.jl:67 [inlined]