Cleanup top-level forward.hpp and types.hpp

[dagardner-nv]

• Remove forward declares for classes that no longer exist, or no longer exist in the top-level mrc namespace.
• Remove duplicate entries.
• Forward-declare structs as structs.
• Fix casing of CpuSet & NumaSet structs.
• Remove unused type-aliases from types.hpp, this could be a potentially breaking change if any users were using these types.

fixes #291

[codecov]

Codecov Report

Merging #292 (0f78454) into branch-23.03 (7a6ea6a) will increase coverage by 0.03%.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-23.03     #292      +/-   ##
================================================
+ Coverage         72.95%   72.98%   +0.03%     
================================================
  Files               381      381              
  Lines             13117    13117              
  Branches            992      991       -1     
================================================
+ Hits               9569     9573       +4     
+ Misses             3548     3544       -4     

Flag	Coverage Δ
cpp	68.73% <ø> (+0.02%)	⬆️
py	41.04% <ø> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
cpp/mrc/src/internal/system/partitions.cpp	78.94% <0.00%> (+0.75%)	⬆️
cpp/mrc/src/internal/resources/manager.cpp	91.91% <0.00%> (+1.01%)	⬆️
cpp/mrc/src/internal/memory/host_resources.cpp	74.28% <0.00%> (+5.71%)	⬆️

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[dagardner-nv]

/merge