Add params and MACs units specifiers

[richardtml]

I've added fomatting.params_units and fomatting.macs_units units specifiers, see issue #183 .

[codecov]

Codecov Report

Merging #188 (6bffb37) into main (fde1cf0) will increase coverage by 0.10%.
The diff coverage is 97.05%.

@@            Coverage Diff             @@
##             main     #188      +/-   ##
==========================================
+ Coverage   97.36%   97.47%   +0.10%     
==========================================
  Files           6        6              
  Lines         570      594      +24     
==========================================
+ Hits          555      579      +24     
  Misses         15       15              

Impacted Files	Coverage Δ
torchinfo/model_statistics.py	98.50% <95.45%> (+0.39%)	⬆️
torchinfo/__init__.py	100.00% <100.00%> (ø)
torchinfo/enums.py	100.00% <100.00%> (ø)
torchinfo/formatting.py	100.00% <100.00%> (ø)

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[TylerYep]

Awesome work here! I'm going to make a couple tweaks to make the configs into enums, but otherwise this should be ready to merge soon.