[MISC] Move std::exit for special formats to parser

[eseiler]

Exit in the parse() function instead of in the format itself. Arguably a better design. May also be needed for #173

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
sharg-parser	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 24, 2023 1:44pm

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (f0b5fc3) 92.30% compared to head (66fa140) 92.30%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #186   +/-   ##
=======================================
  Coverage   92.30%   92.30%           
=======================================
  Files          16       16           
  Lines        1442     1443    +1     
=======================================
+ Hits         1331     1332    +1     
  Misses        111      111           

Impacted Files	Coverage Δ
include/sharg/detail/format_base.hpp	92.93% <ø> (-0.04%)	⬇️
include/sharg/detail/format_help.hpp	89.56% <ø> (ø)
include/sharg/parser.hpp	99.54% <100.00%> (+<0.01%)	⬆️

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