Add string array to lexical casts

[jordan-palacios]

This PR aims to increase the amount of supported parsed types in lexical casts by adding a string array parsing.

Since I was at it, I added tests for all the lexical casts functions; old and new.

[codecov]

Codecov Report

Attention: Patch coverage is 96.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.94%. Comparing base (f97a2cb) to head (c532fd9).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
hardware_interface/src/lexical_casts.cpp	95.45%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2333      +/-   ##
==========================================
- Coverage   88.97%   88.94%   -0.04%     
==========================================
  Files         143      144       +1     
  Lines       16608    16634      +26     
  Branches     1429     1436       +7     
==========================================
+ Hits        14777    14795      +18     
- Misses       1275     1279       +4     
- Partials      556      560       +4     

Flag	Coverage Δ
unittests	88.94% <96.00%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
hardware_interface/test/test_lexical_casts.cpp	100.00% <100.00%> (ø)
hardware_interface/src/lexical_casts.cpp	91.42% <95.45%> (+6.81%)	⬆️

... and 2 files with indirect coverage changes

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[christophfroehlich]

Thanks!

[christophfroehlich]

Failing RHEL tests are not related to this PR, but pal-robotics/pal_statistics#16