[FEATURE] seqan3::structure_record

[marehr]

Part of seqan/product_backlog#289

This implements

• structure_record
• adds member to structure_record, see names IO: make records explicit types + member functions product_backlog#289
• and does some infrastructure

[codecov]

Codecov Report

Merging #2380 (1495d4b) into master (a1d5d4d) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2380   +/-   ##
=======================================
  Coverage   98.21%   98.21%           
=======================================
  Files         265      266    +1     
  Lines       10806    10821   +15     
=======================================
+ Hits        10613    10628   +15     
  Misses        193      193           

Impacted Files	Coverage Δ
include/seqan3/io/structure_file/input.hpp	100.00% <ø> (ø)
include/seqan3/io/structure_file/record.hpp	100.00% <100.00%> (ø)

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[joergi-w]

Looks good, thank you!