Y26-181 - Improve nanoseq performance

[BenTopping]

Closes #5839

Changes proposed in this pull request

• Adds metadatable_type filter to enable API queriers to make use of the index of the table if known and speed up the query.

Limber PR: sanger/limber#2879

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.38%. Comparing base (6a266d3) to head (c466c97).
⚠️ Report is 7 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5850      +/-   ##
===========================================
+ Coverage    87.36%   87.38%   +0.01%     
===========================================
  Files         1480     1480              
  Lines        33637    33662      +25     
  Branches      3573     3576       +3     
===========================================
+ Hits         29388    29414      +26     
+ Misses        4228     4227       -1     
  Partials        21       21              

Flag	Coverage Δ
javascript	76.31% <ø> (ø)
ruby	87.38% <100.00%> (+<0.01%)	⬆️

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