Allocate Plasma Components Dynamically

[AlexanderSinn]

With this PR, plasma components are only allocated at runtime when needed. This includes aabssq, x_prev, ion_level and the AB5 force terms. This allows to store the aabssq on the plasma particle instead of gathering it in every kernel which has become quite tedious. Additionally using the AB5 pusher is now a runtime option instead of a compile time option.

This leads to significant memory savings for simple Wakefield simulations:
PR:

Device Memory Usage:
--------------------------------------------------------------------
Name                                      Nalloc    AvgMem    MaxMem
--------------------------------------------------------------------
The_Arena::Initialize()                        1   163   B    29 GiB
PlasmaParticleContainer::InitParticles()       4    11 GiB    11 GiB
Fields::AllocData()                            1  6055 MiB  6055 MiB
Hipace::ExplicitMGSolveBxBy()                 49  2105 MiB  2112 MiB
FFTPoissonSolverDirichletQuick::define()       8  1151 MiB  1152 MiB
BeamParticleContainer::resize()              903   203 MiB   395 MiB
ResizeRandomSeed                               1    40 MiB    40 MiB
hpmg::MultiGrid::solve1()                   3874    47 KiB   432 KiB
shiftSlippedParticles()                      760    33   B   216 KiB
MultiBuffer::get_data()                      760    12   B   108 KiB
main()                                        17  4351   B  4352   B
Hipace::InitData()                            13  3321   B  3328   B
DepositCurrent_PlasmaParticleContainer()    1001    48   B   256   B
Hipace::Evolve()                               1   255   B   256   B
--------------------------------------------------------------------

Total GPU global memory (MB) spread across MPI: [40441 ... 40441]
Free  GPU global memory (MB) spread across MPI: [9663 ... 9663]
[The         Arena] max space (MB) allocated spread across MPI: [30331 ... 30331]
[The         Arena] max space (MB) used      spread across MPI: [21279 ... 21279]
[The Managed Arena] max space (MB) allocated spread across MPI: [8 ... 8]
[The Managed Arena] max space (MB) used      spread across MPI: [0 ... 0]
[The  Pinned Arena] max space (MB) allocated spread across MPI: [8 ... 8]
[The  Pinned Arena] max space (MB) used      spread across MPI: [0 ... 0]
[The   Comms Arena] max space (MB) allocated spread across MPI: [8 ... 8]
[The   Comms Arena] max space (MB) used      spread across MPI: [0 ... 0]

dev:

Device Memory Usage:
--------------------------------------------------------------------
Name                                      Nalloc    AvgMem    MaxMem
--------------------------------------------------------------------
The_Arena::Initialize()                        1  1099   B    29 GiB
PlasmaParticleContainer::InitParticles()       5    14 GiB    14 GiB
Fields::AllocData()                            1  6055 MiB  6055 MiB
Hipace::ExplicitMGSolveBxBy()                 49  2108 MiB  2112 MiB
FFTPoissonSolverDirichletQuick::define()       8  1152 MiB  1152 MiB
BeamParticleContainer::resize()              903   203 MiB   395 MiB
ResizeRandomSeed                               1    40 MiB    40 MiB
hpmg::MultiGrid::solve1()                   3874    46 KiB   432 KiB
shiftSlippedParticles()                      760    33   B   216 KiB
MultiBuffer::get_data()                      760    12   B   108 KiB
main()                                        17  4351   B  4352   B
Hipace::InitData()                            13  3327   B  3328   B
DepositCurrent_PlasmaParticleContainer()    1001    48   B   256   B
Hipace::Evolve()                               1   255   B   256   B
--------------------------------------------------------------------

Total GPU global memory (MB) spread across MPI: [40441 ... 40441]
Free  GPU global memory (MB) spread across MPI: [9663 ... 9663]
[The         Arena] max space (MB) allocated spread across MPI: [30331 ... 30331]
[The         Arena] max space (MB) used      spread across MPI: [24160 ... 24160]
[The Managed Arena] max space (MB) allocated spread across MPI: [8 ... 8]
[The Managed Arena] max space (MB) used      spread across MPI: [0 ... 0]
[The  Pinned Arena] max space (MB) allocated spread across MPI: [8 ... 8]
[The  Pinned Arena] max space (MB) used      spread across MPI: [0 ... 0]
[The   Comms Arena] max space (MB) allocated spread across MPI: [8 ... 8]
[The   Comms Arena] max space (MB) used      spread across MPI: [0 ... 0]