Optimize prefix size for text indexing automatically

[cmdcolin]

Pairs with this PR to provide an automated search for a prefix size that has reasonably sized bins GMOD/ixixx-js#16

[cmdcolin]

related to issues like #3379

[cmdcolin]

will need GMOD/ixixx-js#16 to pass test

[rbuels]

What a great idea!

[codecov]

Codecov Report

Merging #3385 (e3c1a82) into main (91d6e82) will increase coverage by 0.07%.
The diff coverage is 80.59%.

@@            Coverage Diff             @@
##             main    #3385      +/-   ##
==========================================
+ Coverage   60.04%   60.12%   +0.07%     
==========================================
  Files         777      776       -1     
  Lines       29416    29389      -27     
  Branches     7117     7115       -2     
==========================================
+ Hits        17664    17670       +6     
+ Misses      11561    11528      -33     
  Partials      191      191              

Impacted Files	Coverage Δ
products/jbrowse-cli/src/commands/text-index.ts	70.94% <74.50%> (-0.39%)	⬇️
products/jbrowse-cli/src/commands/add-assembly.ts	89.16% <100.00%> (+0.13%)	⬆️
products/jbrowse-cli/src/testUtil.ts	93.84% <100.00%> (+0.19%)	⬆️
products/jbrowse-cli/src/types/common.ts	71.05% <100.00%> (-1.45%)	⬇️
products/jbrowse-cli/src/types/gff3Adapter.ts	96.96% <100.00%> (ø)
products/jbrowse-cli/src/types/vcfAdapter.ts	97.50% <100.00%> (ø)
products/jbrowse-web/src/util.ts	48.33% <0.00%> (ø)

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