Minor refactors and typescripting improvements

[cmdcolin]

• Remove some type any from Cytobands component
• Modularizes some of the block handling code into smaller components

[codecov]

Codecov Report

Merging #3882 (4713c52) into main (a3196fa) will decrease coverage by 0.02%.
Report is 1 commits behind head on main.
The diff coverage is 55.22%.

@@            Coverage Diff             @@
##             main    #3882      +/-   ##
==========================================
- Coverage   64.45%   64.44%   -0.02%     
==========================================
  Files        1004     1004              
  Lines       29809    29823      +14     
  Branches     7154     7153       -1     
==========================================
+ Hits        19214    19220       +6     
- Misses      10429    10437       +8     
  Partials      166      166              

Files Changed	Coverage Δ
...ins/authentication/src/DropboxOAuthModel/model.tsx	16.66% <0.00%> (ø)
plugins/authentication/src/OAuthModel/model.tsx	8.33% <0.00%> (ø)
...view/src/LinearGenomeView/components/Cytobands.tsx	2.77% <0.00%> (-0.68%)	⬇️
...enome-view/src/LinearGenomeView/components/util.ts	73.07% <ø> (ø)
...-view/src/LinearGenomeView/components/Scalebar.tsx	94.33% <91.30%> (+0.58%)	⬆️
...view/src/LinearGenomeView/components/Gridlines.tsx	92.85% <94.11%> (+0.54%)	⬆️

... and 1 file with indirect coverage changes

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