[MISC] rename seqan3::{alignment => sam}_file_header*

[marehr]

Part of many small rename PRs, tackles seqan/product_backlog#290.

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[codecov]

Codecov Report

Merging #2411 (6411f19) into master (be6f2c1) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2411      +/-   ##
==========================================
- Coverage   98.21%   98.21%   -0.01%     
==========================================
  Files         267      267              
  Lines       10864    10863       -1     
==========================================
- Hits        10670    10669       -1     
  Misses        194      194              

Impacted Files	Coverage Δ
include/seqan3/io/alignment_file/format_bam.hpp	95.59% <ø> (ø)
include/seqan3/io/alignment_file/format_sam.hpp	96.33% <ø> (ø)
include/seqan3/io/alignment_file/input.hpp	100.00% <ø> (ø)
.../seqan3/io/alignment_file/input_format_concept.hpp	100.00% <ø> (ø)
...seqan3/io/alignment_file/output_format_concept.hpp	100.00% <ø> (ø)
include/seqan3/io/alignment_file/record.hpp	100.00% <ø> (ø)
include/seqan3/io/record.hpp	100.00% <ø> (ø)
include/seqan3/range/views/take.hpp	98.46% <ø> (ø)
...clude/seqan3/io/alignment_file/format_sam_base.hpp	98.74% <100.00%> (ø)
include/seqan3/io/alignment_file/header.hpp	100.00% <100.00%> (ø)
... and 3 more

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[simonsasse]

Looks good :)