Add utility function to map attribute numbers

[svenklemm]

This patch adds a function ts_map_attno that can be used to map the attribute number from one relation to another by column name.

Disable-check: force-changelog-changed

[github-actions]

@RafiaSabih, @lkshminarayanan: please review this pull request.

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[codecov]

Codecov Report

Merging #5429 (bde6001) into main (e92d5ba) will decrease coverage by 0.03%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##             main    #5429      +/-   ##
==========================================
- Coverage   90.73%   90.71%   -0.03%     
==========================================
  Files         227      227              
  Lines       52710    52702       -8     
==========================================
- Hits        47829    47807      -22     
- Misses       4881     4895      +14     

Impacted Files	Coverage Δ
src/utils.h	80.00% <ø> (ø)
src/utils.c	65.18% <85.71%> (+0.21%)	⬆️
src/chunk_adaptive.c	92.52% <100.00%> (-0.11%)	⬇️
src/chunk_index.c	94.98% <100.00%> (+0.31%)	⬆️

... and 6 files with indirect coverage changes

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