[MISC] Remove dependency on ranges::move and cpp20::back_inserter.

[smehringer]

Follow up of #44

[vercel]

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🔍 Inspect: https://vercel.com/seqan/sharg-parser/6tSmCr7uVuAQCbJQvbmqDYMHvT3t
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[codecov]

Codecov Report

Merging #47 (b1b3786) into master (46f9f49) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #47      +/-   ##
==========================================
- Coverage   95.55%   95.54%   -0.01%     
==========================================
  Files          13       13              
  Lines         944      942       -2     
==========================================
- Hits          902      900       -2     
  Misses         42       42              

Impacted Files	Coverage Δ
include/sharg/validators.hpp	100.00% <100.00%> (ø)
include/sharg/detail/type_name_as_string.hpp	100.00% <0.00%> (ø)

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[eseiler]

Just one "performance consideration"

[smehringer]

Huh, Your link was with gcc9,
https://quick-bench.com/q/jQCFzTYw6TuC7utVoDzZGRQmf50
out of interest I've selected gcc10. Simple push_back is very fast here:
https://quick-bench.com/q/LB-Gy0UZioJRltB3jbN--MiYEXQ
too bad I can't select gcc11.

Since performance is not critical I prefer the one line anyway. But it's good to keep in mind I think.