Fix pileup sorting when using string tag

[cmdcolin]

Currently if someone tries to sort based on a string tag, it fails to sort

This tries to determine upfront whether a tag is of type string (looks at first element)

Then it sorts using localeCompare to sort the strings

[codecov]

Codecov Report

Merging #1750 (7a65746) into master (d5d643b) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1750      +/-   ##
==========================================
- Coverage   58.81%   58.80%   -0.02%     
==========================================
  Files         454      454              
  Lines       21001    21005       +4     
  Branches     4974     4974              
==========================================
  Hits        12351    12351              
- Misses       8340     8344       +4     
  Partials      310      310              

Impacted Files	Coverage Δ
plugins/alignments/src/PileupRenderer/sortUtil.ts	36.20% <0.00%> (-2.69%)	⬇️
packages/core/util/index.ts	82.52% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d5d643b...7a65746. Read the comment docs.